The World of Opera

 
A voice type is a particular human singing voice identified as having certain qualities or characteristics of vocal range, vocal weight, tessitura, vocal timbre, and vocal transition points (passaggio), such as breaks and lifts within the voice. Other considerations are physical characteristics, speech level, scientific testing, and vocal register. A singer's voice type is identified by a process known as voice classification, by which the human voice is evaluated and thereby designated into a particular voice type. The discipline of voice classification developed within European classical music and is not generally applicable to other forms of singing. Voice classification is often used within opera to associate possible roles with potential voices. Several different voice classification systems are available to identify voice types, including the German Fach system and the choral music system among many others; no system is universally applied or accepted.
Voice classification is a tool for singers, composers, venues, and listeners to categorize vocal properties and to associate roles with voices. While useful, voice classification systems have been used too rigidly, i.e. a house assigning a singer to a specific type and only casting him or her in roles they consider belonging to this category. While choral singers are classified into voice parts based on their vocal range, solo singers are classified into voice types based more on their tessitura – where their voice feels most comfortable for the majority of the time.

A singer will ultimately choose a repertoire that suits his or her instrument. Some singers such as Enrico Caruso, Rosa Ponselle, Joan Sutherland, Maria Callas, Ewa Podleś, or Plácido Domingo have voices that allow them to sing roles from a wide variety of types; some singers such as Shirley Verrett or Grace Bumbry change type and even voice part over their careers; and some singers such as Leonie Rysanek have voices that lower with age, causing them to cycle through types over their careers. Some roles as well are hard to classify, having very unusual vocal requirements; Mozart wrote many of his roles for specific singers who often had remarkable voices, and some of Verdi's early works make extreme demands on his singers.

Number of voice types

Many different voice types are used in vocal pedagogy in a variety of voice classification systems. Most of these types, however, are grouped into seven major voice categories that are, for the most part, acknowledged across the major voice classification systems. Women are typically divided into three groups: soprano, mezzo-soprano, and contralto. Men are usually divided into four groups: countertenor, tenor, baritone, and bass. Some women fall into the tenor or baritone groups, while men identified as countertenors can be grouped as contralto, mezzo-soprano, or soprano. When considering the pre-pubescent voice, an eighth term, treble, is applied. Within each of these major categories, subcategories identify specific vocal qualities such as coloratura facility and vocal weight to differentiate between voices. The vocal range of classical performance covers about five octaves, from a low G1 (in scientific pitch notation) to a high G6. Any individual's voice can perform over a range of one and a half to more than two octaves. Vocal ranges are grouped into overlapping types that each span about two octaves. Many singers fall between groups and can perform some parts in either type. 
 

Classifying singers

Vocal pedagogues generally consider four main qualities of a human voice when attempting to classify it: vocal range, tessitura, timbre, and vocal transition points known as passaggio. However, teachers may also consider physical characteristics, speech level, scientific testing, and other factors such as vocal register. Voice classification into the correct voice type is important for vocal pedagogues and singers as a guiding tool for the development of the voice.

Misclassification of a singer's voice type is dangerous. It can damage the vocal cords, shorten a singing career, and lead to the loss of both vocal beauty and free vocal production. Some of these dangers are not immediate ones; the human voice is quite resilient, especially in early adulthood, and the damage may not make its appearance for months or even years. Unfortunately, this lack of apparent immediate harm can cause singers to develop bad habits that will over time cause irreparable damage to the voice. Singing outside the natural vocal range imposes a serious strain upon the voice. Clinical evidence indicates that singing at a pitch level that is either too high or too low creates vocal pathology. According to vocal pedagogue Margaret Greene, "The need for choosing the correct natural range of the voice is of great importance in singing since the outer ends of the singing range need very careful production and should not be overworked, even in trained voices." Singing at either extreme of the range may be damaging, but the possibility of damage seems to be much more prevalent in too high a classification. A number of medical authorities have indicated that singing at too high a pitch level may contribute to certain vocal disorders. Medical evidence indicates that singing at too high of a pitch level may lead to the development of vocal nodules. Increasing tension on the vocal cords is one of the means of raising pitch. Singing above an individual's best tessitura keeps the vocal cords under a great deal of unnecessary tension for long periods of time, and the possibility of vocal abuse is greatly increased. Singing at too low a pitch level is not as likely to be damaging unless a singer tries to force the voice down.
 

Dangers of quick identification

Many vocal pedagogues warn of the dangers of quick identification. Premature concern with classification can result in misclassification, with all its attendant dangers. Notable vocal pedagogue William Vennard has stated, "I never feel any urgency about classifying a beginning student. So many premature diagnoses have been proved wrong, and it can be harmful to the student and embarrassing to the teacher to keep striving for an ill-chosen goal. It is best to begin in the middle part of the voice and work upward and downward until the voice classifies itself." Most vocal pedagogues believe that it is essential to establish good vocal habits within a limited and comfortable range before attempting to classify the voice. When techniques of posture, breathing, phonation, resonation, and articulation have become established in this comfortable area, the true quality of the voice will emerge and the upper and lower limits of the range can be explored safely. Only then can a tentative classification be arrived at, and it may be adjusted as the voice continues to develop. Many vocal pedagogues suggest that teachers begin by assuming that a voice is of a medium classification until it proves otherwise. The reason for this is that the majority of individuals possess medium voices and therefore this approach is less likely to misclassify or damage the voice.
 

Choral music classification
 

Unlike other classification systems, choral music divides voices solely on the basis of vocal range. Choral music most commonly divides vocal parts into high and low voices within each sex: soprano and alto vocal ranges for females, tenor and bass vocal ranges for males (SATB), and occasionally treble for children. As a result, the typical chorus affords many opportunities for misclassification to occur. Since most people have medium voices, they are often assigned a part that is either too high or too low for them; the mezzo-soprano must sing soprano or alto and the baritone must sing tenor or bass. Either option can present problems for the singer, but for most singers there are fewer dangers in singing too low, than in singing too high

 
Vocal register
 

A vocal register is a range of tones in the human voice produced by a particular vibratory pattern of the vocal folds. These registers include modal voice (or normal voice), vocal fry, falsetto, and the whistle register. Registers originate in laryngeal function. They occur because the vocal folds are capable of producing several different vibratory patterns. Each of these vibratory patterns appears within a particular range of pitches and produces certain characteristic sounds.
In speech pathology, the vocal register has three components: a certain vibratory pattern of the vocal folds, a certain series of pitches, and a certain type of sound. Although this view is also adopted by many vocal pedagogists, others define vocal registration more loosely than in the sciences, using the term to denote various theories of how the human voice changes, both subjectively and objectively, as it moves through its pitch range. There are many divergent theories on vocal registers within vocal pedagogy, making the term somewhat confusing and at times controversial within the field of singing. Vocal pedagogists may use the term vocal register to refer to any of the following:

A labeled anatomical diagram of the vocal folds or cords.
A particular part of the vocal range such as the upper, middle, or lower registers.
A resonance area such as chest voice or head voice.
A phonatory process
A certain vocal timbre
A region of the voice which is defined or delimited by vocal breaks.

The number of vocal registers

Vocal registers arise from different vibratory patterns produced by the vocal cords. Research by speech pathologists and some vocal pedagogists has revealed that the vocal cords are capable of producing at least four distinct vibratory forms, although not all persons can produce all of them. The first of these vibratory forms is known as natural or normal voice; another name for it is modal voice, a term currently widely used in both speech pathology and vocal pedagogy publications. In this usage, modal refers to the natural disposition or manner of action of the vocal cords. The other three vibratory forms are known as vocal fry, falsetto, and whistle. Each of these four registers has its own vibratory pattern, its own pitch area (although there is some overlapping), and its own characteristic sound. Arranged by the pitch areas covered, vocal fry is the lowest register, modal voice is next, then falsetto, and finally the whistle register.

While speech pathologists and scholars of phonetics consistently divide the voice into these four registers, vocal pedagogists are divided on this issue. Indiscriminate use of the word register has led to much confusion and controversy about the number of registers in the human voice within vocal pedagogical circles. This controversy does not exist within speech pathology and the other sciences, because vocal registers are viewed from a purely physiological standpoint that is concerned with laryngeal function. Various writers concerned with the art of singing state that there are anywhere from one to seven registers present. The diversity of opinion in this area is quite wide and there is no one consensus or point of view.

One prevailing practice within vocal pedagogy is to divide both men and women's voices into three registers. Men's voices are designated "chest", "head", and "falsetto" and women's voices are "chest", "middle", and "head". This way of classifying registers, however, is not universally accepted. Many vocal pedagogists partially blame this confusion on the incorrect use of the terms "chest register" and "head register". These professionals argue that, since all registers originate in laryngeal function, it is meaningless to speak of registers being produced in the chest or head. The vibratory sensations which are felt in these areas are resonance phenomena and should be described in terms related to resonance, not to registers. These vocal pedagogists prefer the terms "chest voice" and "head voice" over the term register. Many of the problems which people identify as register problems are really problems of resonance adjustment. This helps to explain the multiplicity of registers which some vocal pedagogists advocate. For the purposes of this article, resonance problems are relegated to their own area since their usage here is controversial and without an overall supporting consensus. For more information on resonance see Vocal resonation.

The confusion which exists concerning what a register is, and how many registers there are, is due in part to what takes place in the modal register when a person sings from the lowest pitches of that register to the highest pitches. The frequency of vibration of the vocal folds is determined by their length, tension, and mass. As pitch rises, the vocal folds are lengthened, tension increases, and their thickness decreases. In other words, all three of these factors are in a state of flux in the transition from the lowest to the highest tones.

If a singer holds any of these factors constant and interferes with their progressive state of change, his laryngeal function tends to become static and eventually breaks occur, with obvious changes of tone quality. These breaks are often identified as register boundaries or as transition areas between registers. The distinct change or break between registers is called a passaggio or a ponticello. Vocal pedagogists teach that, with study, a singer can move effortlessly from one register to the other with ease and consistent tone. Registers can even overlap while singing. Teachers who like to use this theory of "blending registers" usually help students through the "passage" from one register to another by hiding their "lift" (where the voice changes).

However, many pedagogists disagree with this distinction of boundaries blaming such breaks on vocal problems which have been created by a static laryngeal adjustment that does not permit the necessary changes to take place. This difference of opinion has affected the different views on vocal registration.

Vocal fry register
The vocal fry register is the lowest vocal register and is produced through a loose glottal closure which will permit air to bubble through with a popping or rattling sound of a very low frequency. The chief use of vocal fry in singing is to obtain pitches of very low frequency which are not available in modal voice. This register may be used therapeutically to improve the lower part of the modal register. This register is not used often in singing, but male quartet pieces, and certain styles of folk music for both men and women have been known to do so.
 

Modal voice register

The modal voice is the usual register for speaking and singing, and the vast majority of both are done in this register. As pitch rises in this register, the vocal folds are lengthened, tension increases, and their edges become thinner. A well-trained singer or speaker can phonate two octaves or more in the modal register with consistent production, beauty of tone, dynamic variety, and vocal freedom. This is possible only if the singer or speaker avoids static laryngeal adjustments and allows the progression from the bottom to the top of the register to be a carefully graduated continuum of readjustments.
 

Falsetto register

The falsetto register lies above the modal voice register and overlaps the modal register by approximately one octave. The characteristic sound of falsetto is inherently breathy and flute-like with few overtones present. Both men and women can phonate in the falsetto register. The essential difference between the modal and falsetto registers lies in the amount and type of vocal cord involvement. The falsetto voice is produced by the vibration of the ligamentous edges of the vocal cords, in whole or in part, and the main body of the fold is more or less relaxed. In contrast, the modal voice involves the whole vocal cord with the glottis opening at the bottom first and then at the top. The falsetto voice is also more limited in dynamic variation and tone quality than the modal voice.
 

Whistle register

The whistle register is the highest register of the human voice. The whistle register is so called because the timbre of the notes that are produced from this register are similar to that of a whistle or the upper notes of a flute, whereas the modal register tends to have a warmer, less shrill timbre. Women of all voice types can use the whistle register. With proper vocal training, it is possible for most women to develop this part of the voice, but some women are unable to do so. Men within the Countertenor and Tenor voice types can develop this part of the voice as well with a proper vocal training, and children can also phonate in the whistle register.


Bel canto
 

Bel canto (Italian for "beautiful singing" or "beautiful song", pronounced [bɛl ˈkanto]), along with a number of similar constructions ("bellezze del canto"/"bell'arte del canto"), is a term relating to Italian singing. It has several different meanings and is subject to a wide variety of interpretations.
The words were not associated with a "school" of singing until the middle of the 19th century, when writers in the early 1860s used it nostalgically to describe a manner of singing that had begun to wane around 1830. Nonetheless, "neither musical nor general dictionaries saw fit to attempt [a] definition [of bel canto] until after 1900". The term remains vague and ambiguous in the 21st century and is often used to evoke a lost singing tradition.
 

Bel canto in the 18th and early 19th centuries

Since the bel canto style flourished in the 18th and early 19th centuries, the music of Handel and his contemporaries, as well as that of Mozart and Rossini, benefits from an application of bel canto principles. Operas received the most dramatic use of the techniques, but the bel canto style applies equally to oratorio, though in a somewhat less flamboyant way. The da capo arias these works contained provided challenges for singers, as the repeat of the opening section prevented the story line from progressing. Nonetheless, singers needed to keep the emotional drama moving forward, and so they used the principles of bel canto to help them render the repeated material in a new emotional guise. They also incorporated embellishments of all sorts (Domenico Corri said da capo arias were invented for that purpose), but not every singer was equipped to do this, some writers, notably Domenico Corri himself, suggesting that singing without ornamentation was an acceptable practice. Singers regularly embellished both arias and recitatives, but did so by tailoring their embellishments to the prevailing sentiments of the piece.

Two famous 18th-century teachers of the style were Antonio Bernacchi (1685–1756) and Nicola Porpora (1686–1768), but many others existed. A number of these teachers were castrati. Singer/author John Potter declares in his book Tenor: History of a Voice that:

For much of the 18th century castrati defined the art of singing; it was the loss of their irrecoverable skills that in time created the myth of bel canto, a way of singing and conceptualizing singing that was entirely different from anything that the world had heard before or would hear again.
 

Bel canto in 19th-century Italy and France

In another application, the term bel canto is sometimes attached to Italian operas written by Vincenzo Bellini (1801–1835) and Gaetano Donizetti (1797–1848). These composers wrote bravura works for the stage during what musicologists sometimes call the "bel canto era". But the style of singing had started to change around 1830, Michael Balfe writing of the new method of teaching that was required for the music of Bellini and Donizetti (A New Universal Method of Singing, 1857, p. iii), and so the operas of Bellini and Donizetti actually were the vehicles for a new era of singing. The last important opera role for a castrato was written in 1824 by Giacomo Meyerbeer [1791–1864].

The phrase "bel canto" was not commonly used until the latter part of the 19th century, when it was set in opposition to the development of a weightier, more powerful style of speech-inflected singing associated with German opera and, above all, Richard Wagner's revolutionary music dramas. Wagner (1813–1883) decried the Italian singing model, alleging that it was concerned merely with "whether that G or A will come out roundly". He advocated a new, Germanic school of singing which would draw "the spiritually energetic and profoundly passionate into the orbit of its matchless Expression".

Interestingly enough, French musicians and composers never embraced the more florid extremes of the 18th-century Italian bel canto style. They disliked the castrato voice and because they placed a premium on the clear enunciation of the texts of their vocal music, they objected to the sung word being obscured by excessive fioritura.

The popularity of the bel canto style as espoused by Rossini, Donizetti and Bellini faded in Italy during the mid-19th century. It was overtaken by a heavier, more ardent, less embroidered approach to singing that was necessary in order to perform the innovative works of Giuseppe Verdi (1813–1901) with maximum dramatic impact. Tenors, for instance, began to inflate their tone and deliver the high C (and even the high D) directly from the chest rather than resorting to a suave head voice/falsetto as they had done previously—sacrificing vocal agility in the process. Sopranos and baritones reacted in a similar fashion to their tenor colleagues when confronted with Verdi's drama-filled compositions. They subjected the mechanics of their voice production to greater pressures and cultivated the exciting upper part of their respective ranges at the expense of their mellow but less penetrant lower notes. Initially at least, the singing techniques of 19th-century contraltos and basses were less affected by the musical innovations of Verdi, which were built upon by his successors Amilcare Ponchielli (1834–1886) and Arrigo Boito (1842–1918).
 

Bel canto and its detractors

One reason for the eclipse of the old Italian singing model was the growing influence within the music world of bel canto's detractors, who considered it to be outmoded and condemned it as vocalization devoid of content. To others, however, bel canto became the vanished art of elegant, refined, sweet-toned musical utterance. Rossini lamented in a conversation that took place in Paris in 1858 that: "Alas for us, we have lost our bel canto". Similarly, the so-called German style was as derided as much as it was heralded. In the introduction to a collection of songs by Italian masters published in 1887 in Berlin under the title Il bel canto, Franz Sieber wrote: "In our time, when the most offensive shrieking under the extenuating device of 'dramatic singing' has spread everywhere, when the ignorant masses appear much more interested in how loud rather than how beautiful the singing is, a collection of songs will perhaps be welcome which – as the title purports – may assist in restoring bel canto to its rightful place."

In the late-19th century and early-20th century, the term "bel canto" was resurrected by Italy's singing teachers, among whom the retired Verdi baritone Antonio Cotogni (1831–1918) was perhaps the pre-eminent figure. Cotogni and his followers invoked it against an unprecedentedly vehement, unsubtle and vibrato-laden style of vocalism which was being adopted by more and more post-1890 singers in order to cope with the impassioned demands of the stream of verismo operas that were flowing from the pens of Giacomo Puccini (1858–1924), Ruggero Leoncavallo (1857–1919), Pietro Mascagni (1863–1945) and Umberto Giordano (1867–1948); and the auditory challenges posed by the non-Italianate stage works of Richard Strauss (1864–1949) and other late-romantic/early modern era composers, with their strenuous and angular vocal lines and often thick orchestral textures.

To make the situation worse, during the 1890s, the directors of the Bayreuth Festival began propagating a particularly forceful style of Wagnerian singing that placed such an undue emphasis on the articulation of the individual words of the composer's libretti, the all-important musical component of his operas was compromised. Called "Sprechgesang" by its proponents and the "Bayreuth bark" by its opponents, this hectoring, text-based, anti-legato approach to vocalism spread across the German-speaking parts of Europe prior to World War I. It was totally at odds with the Italian ideals of "beautiful singing".

As a result of these many factors, the concept of bel canto became shrouded in mystique and confused by a plethora of individual notions and interpretations. To complicate matters further, German musicology in the early 20th century invented its own historical application for "bel canto", using the term to denote the simple lyricism that came to the fore in Venetian opera and the Roman cantata during the 1630s and '40s (the era of composers Antonio Cesti, Giacomo Carissimi and Luigi Rossi) as a reaction against the earlier, text-dominated "stilo rappresentativo". Unfortunately, this anachronistic use of the term bel canto was given wide circulation in Robert Haas's Die Musik des Barocks and, later, in Manfred Bukofzer's Music in the Baroque Era. Since the singing style of later 17th-century Italy did not differ in any marked way from that of the 18th century and early 19th century, a connection can be drawn; but, according to Jander, most musicologists agree that the term is best limited to its mid-19th-century use, designating a style of singing that emphasized beauty of tone and technical expertise in the delivery of music that was either highly florid or featured long, flowing and difficult-to-sustain passages of cantilena.
 

The bel canto revival
In the 1950s, the phrase "bel canto revival" was coined to refer to a renewed interest in the operas of Donizetti, Rossini and Bellini. These composers had begun to go out of fashion during the latter years of the 19th century and their works, while never completely disappearing from the performance repertoire, were staged infrequently during the first half of the 20th century, when the operas of Wagner, Verdi and Puccini held sway. That situation changed significantly after World War II with the advent of a group of enterprising orchestral conductors and the emergence of a fresh generation of singers such as Montserrat Caballé, Maria Callas, Joan Sutherland, and Marilyn Horne, who had acquired bel canto techniques. These artists breathed new life into Donizetti, Rossini and Bellini's stage compositions, treating them seriously as music and re-popularizing them throughout Europe and America. Today, some of the world's most frequently performed operas, such as Rossini's The Barber of Seville and Donizetti's Lucia di Lammermoor, are from the bel canto era.

Not coincidentally, the 18th-century operas of Wolfgang Amadeus Mozart (1756–1791), which require adroit bel canto skills if they are to be performed well, also experienced a post-war revival that shows no sign of abating, while the florid operas composed by Mozart's predecessor Handel have undergone a similar surge in popularity during recent decades. "I should think that performances of Handel operas now outnumber all others" avers classical music commentator Simon Callow in the April 2010 issue of Gramophone magazine.
 

The bel canto teaching legacy
Musicologists occasionally apply the label "bel canto technique" to the arsenal of virtuosic vocal accomplishments and concepts imparted by singing teachers to their students during the late 18th century and the early 19th century. Many of these teachers were castrati.

"All [their] pedagogical works follow the same structure, beginning with exercises on single notes and eventually progressing to scales and improvised embellishments" writes Potter who continues, "The really creative ornamentation required for cadenzas, involving models and formulae that could generate newly improvised material, came towards the end of the process."

Today's pervasive idea that singers should refrain from improvising and always adhere strictly to the letter of a composer's published score is a comparatively recent phenomenon, promulgated during the first decades of the 20th century by dictatorial conductors such as Arturo Toscanini [1867–1957], who championed the dramatic operas of Verdi and Wagner and believed in keeping performers on a tight interpretive leash. This is noted by both Potter (page 77) and Michael Scott

Potter notes, however, that as the 19th century unfurled:

The general tendency ... was for singers not to have been taught by castrati (there were few of them left) and for serious study to start later, often at one of the new conservatories rather than with a private teacher. The traditional techniques and pedagogy were still acknowledged, but the teaching was generally in the hands of tenors and baritones who were by then at least once removed from the tradition itself.

Early 19th-century teachers described the voice as being made up of three registers. The chest register was the lowest of the three and the head register the highest, with the passaggio in between. These registers needed to be smoothly blended and fully equalized before a trainee singer could acquire total command of his or her natural instrument, and the surest way to achieve this outcome was for the trainee to practise vocal exercises assiduously. Bel canto-era teachers were great believers in the benefits of vocalise and solfeggio. They strove to strengthen the respiratory muscles of their pupils and equip them with such time-honoured vocal attributes as "purity of tone, perfection of legato, phrasing informed by eloquent portamento, and exquisitely turned ornaments", as noted in the introduction to Volume 2 of Scott's The Record of Singing.

Major refinements occurred to the existing system of voice classification during the 19th century as the international operatic repertoire diversified, split into distinctive nationalist schools and expanded in size. Whole new categories of singers such as mezzo-soprano and Wagnerian bass-baritone arose towards the end of the 19th century, as did such new sub-categories as lyric coloratura soprano, dramatic soprano and spinto soprano, and various grades of tenor, stretching from lyric through spinto to heroic. These classificatory changes have had a lasting effect on the way singing teachers designate voices and the way in which opera house managements cast their productions.

It would be wrong, however, to think that there was across-the-board uniformity among 19th-century bel canto adherents when it came to passing on their knowledge and instructing students. Each of them had their own training regimes and pet notions; but, fundamentally, they all subscribed to the same set of bel canto precepts, and the exercises that they devised in order to enhance their students' breath support, dexterity, range and technical control remain valuable and, indeed, are still employed by some teachers.

Manuel García (1805–1906), author of the influential treatise L'Art du Chant, was the most prominent of the group of pedagogues that perpetuated bel-canto principles in their teachings and writings during the second half of the 19th century. His like-minded younger sister, Pauline Viardot (1821–1910), was also an important teacher of voice, as were Viardot's contemporaries Mathilde Marchesi, Camille Everardi, Julius Stockhausen, Carlo Pedrotti, Venceslao Persichini, Giovanni Sbriglia, Melchiorre Vidal and Francesco Lamperti (together with Francesco's son Giovanni Battista Lamperti). The voices of a number of their former students can be heard on acoustic recordings made in the first two decades of the 20th century and re-issued since on LP and CD.

Some examples on disc of historically and artistically significant 19th-century singers whose bel canto-infused vocal styles and techniques pre-date the "Bayreuth bark" and the dramatic excesses of verismo opera are:

Sir Charles Santley (born 1834), Gustav Walter (born 1834), Adelina Patti (born 1843), Marianne Brandt (born 1842), Lilli Lehmann (born 1848), Jean Lassalle (born 1847), Victor Maurel (born 1848), Marcella Sembrich (born 1858), Lillian Nordica (born 1857), Emma Calvé (born 1858), Nellie Melba (born 1861), Francesco Tamagno (born 1850), Francesco Marconi (born 1853), Léon Escalais (born 1859), Mattia Battistini (born 1856), Mario Ancona (born 1860), Pol Plançon (born 1851), and Antonio Magini-Coletti and Francesco Navarini (both born 1855).