Oxford Music Online: Introductory articles on musicians, music cultures, styles, and musical instruments, with sources for further information.
Continuum Encyclopedia of Popular Music of the World: Complete (8 vols.) in Bixler Library. MUSIC REF ML102.P66 C66 2003. Online versions (not complete set) accessible in the online catalog
Garland Encyclopedia of World Music Online. Also in print in Bixler Library, with accompanying CDs. MUSIC REF ML100.G16 1998 volumes 1-10.
The New Grove Dictionary of Musical Instruments. Ed. Stanley Sadie. Three volumes. Print edition. MUSIC REF ML 102.I5.N48 1984. See also Oxford Music Online, above.
Post, Jennifer. Ethnomusicology: A Research and Information Guide. 2nd ed. Routledge, 2011. Bixler Library MUSIC ML 128.E8 P67 2011