Giovanni Battista Mancini was an Italian soprano castrato, voice teacher, and author. 

He was 1 January 1714 born in Ascoli Piceno, Italy. Mancini studied singing in Naples under Leonardo Leo and in Bologna with Antonio Bernacchi (1685-1756). Additionally, he pursued composition and counterpoint studies with Giovanni Battista Martini.

Commencing his singing career at the age of 16, Mancini performed across Italy and Germany. However, his reputation as a teacher surpassed his acclaim as a singer, leading Empress Maria Theresia of Austria to appoint him as "k. k. Cammer-Musicus" in 1757 to instruct her daughters in singing.

Mancini is considered a teacher of the Bel Canto tradition, more specifically, he was teaching and forming his pedagogical concepts in the context of the Neapolitan School of Music. 

On this Neapolitan School of Music, Hugh Milton Miller writes: "The melodic style of the Neapolitan School is characterized by vocal embellishment, florid writing and coloratura, much of which was improvised by the singer. In addition to the ornamental melodic style, virtuosity was of great importance to the Neapolitans." (Miller, 1962, pp. 75-76)

In 1774, he published a seminal work on singing titled Practical Reflections on Figured Singing (English title) in Vienna. Mancini's teachings emphasized the importance of various vocal techniques, including Messa di Voce, Appogiatura, the Trill, Passages, Cadenza, and the blending of vocal registers. Mancini was influenced by the writings and pedagogy of Pier-Francesco Tosi (1647-1727), which is evidenced by the multiple citings of Tosi in his book. 

Giambattista Mancini and Vincenzo Manfredini, prominent 18th-century singing masters, engaged in a prolonged dispute over vocal training methods, particularly concerning trill execution. Lasting over two decades, their disagreement highlighted the balance between ornamental creativity and vocal stability. Despite intense controversy, their methods spurred interpretive diversity and marked an evolutionary leap in vocal performance.

Mancini continued his tenure in Vienna until his death, leaving behind a substantial fortune as a "Retired Singing Master." Giovanni Battista Mancini died on the 4th of January, 1800. 

Mancini on Singing:

"The voice ordinarily divides itself into two registers, one called chest register and the other head register, or falsetto to." (Practical Reflections, 1774/1967, p.58)

"The great art of the singer consists in acquiring the ability to render imperceptible to the ear, the passing from the one register to the other. In other words, to unite the two, so as to have perfect quality of voice throughout the whole range, each tone being on a level with your best and purest tone. This is art and it is not easy to reach the goal." (Practical Reflections, 1774/1967, p.59)

"All things being considered, I will close with one word. Strength lies in a perfect balance of edge, and in ones availing oneself of those graces and embellishments of the art, which are substantially the beauty of the art and the formation of a “virtuoso” style which distinguishes the master from the mediocrity." (Practical Reflections, 1774/1967, p.140-141)

References:

• Practical Reflections on Figured Singing. (1774). Translated into English by Edward Foreman. Champaign, IL: Pro Musica Press. (Original work published 1967).
• Brandon, B. A. (1970). Ornamentation of Italian Vocal Music of the Eighteenth Century According to Pietro Francesco Tosi and Giovanni Battista Mancini (Master's thesis). University of North Dakota, Grand Forks, ND. Retrieved from https://commons.und.edu/cgi/viewcontent.cgi?article=1836&context=theses
• Wikipedia contributors. (n.d.). Giovanni Battista Mancini. In Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Giovanni_Battista_Mancini#:~:text=Giovanni%20Battista%20Mancini%20(1%20January,in%20Bologna%20with%20Antonio%20Bernacchi.
• Hugh Milton Miller, History of Music (Third Ed. Barnes & Nobel, 1962) / pp, 75-76 o
• Mancini, A., & Manfredini, G. (2023). Mancini vs. Manfredini, or the Tril Controversy. Bulletin of the Transilvania University of Braşov Series VIII Performing Arts, 15(64), 3-1. https://doi.org/10.31926/but.p...