American Music Resource
Searches by keyword, topic index, and subject index for music from the Western Hemisphere. Results from searches include links and bibliographies. Site is under development, so some topics aren’t yet available.
Opera Glass
Source for opera libretti, original texts, composers, histories, companies, discographies, and some visual images, as well as links to other sites. Fairly lo-fi, but easily navigable and full of useful information.
Recording Industry Association of America
Official site of recording industry, with news on legislation and the association’s own measures and views on issues such as piracy. Also includes large databases of platinum and gold records, and a glossary of legislation and codes.
Sibelius Academy Music Resources
Links to sites for music of all kinds, from pop/rock to Finnish to computer tunes, plus music magazines, music schools, instruments, and libraries. You can’t search it, but if you have a decent idea of what you’re looking for, you’ll get a wealth of information.
Stage and Song
Site is geared toward actors and singers, but has useful listings of regional theaters, schools, organizations, and auditions.