Pier Francesco Tosi
Pier Francesco Tosi (c. 16531732) 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. Provided by Wikipedia-
1Classmark: 1981 a 0758Book
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2Classmark: 1981 a 0198Book