He made his debut in Le Chemineau by Leroux in 1925 at the Opéra-Comique and went on to sing many other French and Italian roles in the Opéra-Comique repertoire.
Musy was a member of the four-member committee which ran the Opéra-Comique after the liberation of Paris during 1944. From 1947 he was a director of staging at the theatre. His pupils included Xavier Depraz, Jean Dupouy, Jacques Loreau, Irène Sicot and Remy Corazza.
He sang in recordings of Carmen in 1927 (as Escamillo), Faust in 1930 (Valentin), The Tales of Hoffman in 1948 (Lindorf), and Louise in 1956 (Father); as well as L'école des maris by Emmanuel Bondeville in 1954 (Sganarelle), and Les mousquetaires au couvent 1957 (Bridaine) and La fille de Madame Angot in 1958 (Larivaudière).
- Kutsch KJ, Riemens L. Großes Sängerlexikon. Francke, Bern & Stuttgart, 1987.
- Wolff S. Un demi-siècle d'Opéra-Comique (1900-1950). André Bonne, Paris, 1953.