From Citizendium, the Citizens' Compendium
- Please sort and annotate in a user-friendly manner and consider archiving the URLs behind the links you provide. See also related web sources.
- Musopen — provides recorded music, sheet music and a music textbook all under a CC0 license which allows unrestricted use, reuse and redistribution
- Oxford Music Online, includes the Grove Dictionary of Music and Musicians.
- Musica Viva Encyclopaedia
- The Music-Web Music Encyclopedia, for musicians, composers and music lovers
- The Virginia Tech Multimedia Music Dictionary, with definitions, pronunciations, examples, quizzes and simulations