He began his singing career when he was 16, appearing in both Italy and Germany. His even greater success as a teacher led to an invitation in 1757 by Empress Maria Theresia of Austria to become "k. k. Cammer-Musicus" and thereby teach her daughters singing. In 1774 in Vienna he published an important book on singing Pensieri, e riflessioni pratiche sopra il canto figurato. His views and publications brought him into conflict with another voice teacher, Vincenzo Manfredini. He remained in Vienna and died there as "Retired Singing Master", leaving behind a considerable fortune.
Publications
Pensieri e riflessioni pratiche sopra il canto figurato. Vienna, 1774.
Practical Reflections on the Figurative Art of Singing. Milan, 1776. Translated into English by Pietro Buzzi. Boston: The Gorham Press, 1912.
Practical Reflections on Figured Singing. (1774). Translated into English by Edward Foreman. Champaign, IL: Pro Musica Press, 1967.
Riflessioni pratiche sul Canto figurato. Third edition (revised, corrected and augmented). Includes musical examples. Milan: Galeazzi, 1777.
References
Ortkemper, Hubert. Engel wider Willen: Die Welt der Kastraten. Berlin: Henschel Verlag, 1993. ISBN3-89487-006-0