AllMusic.com
A complete and current resource for recordings of all types of music including reviews, biographical information on the artists, historical information, ordering listings, and retail links.

Classical Music Library
Classical Music Library is the world's largest multi-label database of Classical music recordings for listening and learning in libraries.

Grammy Awards
A website dedicated to the annual Grammy awards including information about nominees and winners.

Metacritic.com
Compiles reviews from critics and publications covering film, music, video/DVD and games.

Rock & Roll Hall of Fame
The official site of the Rock & Roll Hall of Fame. Lots of music history here for kids writing papers, giving oral reports, etc.

Smithsonian Global Sound
Smithsonian Global Sound, produced in partnership with Smithsonian Folkways Recordings, is a virtual encyclopedia of the world's musical and aural traditions. The collection provides educators, students, and interested listeners with an unprecedented variety of online resources that support the creation, continuity, and preservation of diverse musical forms.