Music: History, Composers, and Performers: Biographies
- Nicolas Gombert
- Niels Vilhelm Gade
- Nigel Kennedy
- Ole Bornemann Bull
- Olive Nayan Fremstad
- Olivier Messiaen
- Orlando di Lasso
- Orlando Gibbons
- Oscar Hammerstein
- Oscar Hammerstein 2d
- Oscar Straus
- Ossip Gabrilowitsch
- Otto Klemperer
- Otto Nicolai
- Ottorino Respighi
- Pablo (Pau) Casals
- Pablo de Sarasate
- Paul Creston
- Paul Dessau
- Paul Dukas