Pier Francesco Tosi

Title plate from the English Translation of Tosi's singing treatise, Observations on the Florid Song, first published in England in 1743.

Pier Francesco Tosi (c. 1653 – 1732) was a castrato singer, composer, and writer on music. His Opinoni de' cantori antichi e moderni... was the first full-length treatise on singing and provides a unique glimpse into the technical and social aspects of Baroque vocal music.