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.

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.