Music

The Aria Database information on opera arias
The Classical Music Navigator information on classical music composers and their works
IMSLP International Music Score Library free sheet music in the public domain, “a music library to provide music scores free of charge to anyone with internet access”
Kirk Collection: Popular Song Index a catalog of digitized sheet music for popular songs from 1865-1968–from the Cunningham Memorial Library at Indiana State University
Lyrics World extensive database of song lyrics
National Jukebox historical recordings from the Library of Congress
Second Hand Songs extensive database of songs–find out who did the original version or who redid a song
The San Fransisco Symphony Watch, Listen & Learn an interactive guide composers and symphonies

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