Encyclopedia of popular music / compiled & edited by Colin Larkin 30,000 entries cover all genres and periods of popular music from 1900 to the present day, including jazz, country, folk, rap, reggae, techno, musicals, and world music.
Garland encyclopedia of world music / advisory editors, Bruno Nettl and Ruth M. Stone ; founding editors, James Porter and Timothy Rice.
Oxford Music Online, a.k.a. Grove Music Online by Containing: