The Florentine musician Jacopo Peri (1561-1633) is known as the composer of the first operas--they include the earliest to survive complete, Euridice (1600), in which Peri sang the role of Orpheus. A large collection of recently discovered account books belonging to him and his family allows for a greater exploration of Peri's professional and personal life. Richard Goldthwaite, an economic historian, and Tim Carter, a musicologist, have...