These music sites have interactive music games as well as information about famous composers. Most of these sites center around classical music.

Classics for Kids - WGUC
http://www.classicsforkids.com/

New York Philharmonic Kids Zone
http://www.nyphilkids.org/

Online Music Games
http://www.flashmusicgames.com/

San Francisco Symphony Kids
http://www.sfskids.org/templates/splash.asp


Music Tech Teacher
http://www.musictechteacher.com/musicquizzes.htm
Quizzes and information on music and music theory

Chrome Music Lab
https://musiclab.chromeexperiments.com/

Radio City Music Hall Virtual Tour
http://www.samrohn.com/360-panorama/radio-city-music-hall-360-virtual-tour/