- Carnegie Hall (New York, N.Y.).1
- Casadesus, Robert, 1899-1972.3
- Chadwick, G. W. (George Whitefield), 1854-19311
- Chasins, Abram, 1903-1987.1
- Cincinnati Conservatory of Music1
- Columbia University. Teachers College.1
- Conant, James Bryant, 1893-19781
- Cooke, James Francis, 1875-19602
- Cooley, Carlton.1
- Cornell University3
- Correspondence✖[remove]270
- Crow, Orin Faison, 1896-19551
- Damrosch, Walter, 1862-19501
- Doris Duke Foundation15
- Doris Duke Foundation.14
- Dougherty, Celius, 1902-1986.1
- Downes, Olin, 1886-19552
- Downes, Olin, 1886-1955.2
- Duke, Doris, 1912-1993.1
- Einstein, Alfred, 1880-19521