Here is a page full of music fun online!
http://www.classicsforkids.com/games/
http://www.dariamusic.com/
http://www.sfskids.org/templates/home.asp?pageid=1
http://www.nyphilkids.org/main.phtml?
http://www.musiclearningcommunity.com/
http://pianoeducation.org/pnokids.html
http://www.yellowcatpublishing.com/
http://datadragon.com/education/
http://www.teoria.com/
http://www.uptoten.org/
http://www.atozkidsstuff.com/
http://www.homeworkspot.com/theme/classicalmusic.htm
http://library.thinkquest.org/15413/
http://www.tritonemusic.com/
http://www.musictheory.net/
http://www.easymusictheory.com/lessons.html
http://www.creatingmusic.com/
http://pbskids.org/chuck/index.html#/jazz
http://www.anvilstudio.com/
http://www.classicsforkids.com/games/
http://www.dariamusic.com/
http://www.sfskids.org/templates/home.asp?pageid=1
http://www.nyphilkids.org/main.phtml?
http://www.musiclearningcommunity.com/
http://pianoeducation.org/pnokids.html
http://www.yellowcatpublishing.com/
http://datadragon.com/education/
http://www.teoria.com/
http://www.uptoten.org/
http://www.atozkidsstuff.com/
http://www.homeworkspot.com/theme/classicalmusic.htm
http://library.thinkquest.org/15413/
http://www.tritonemusic.com/
http://www.musictheory.net/
http://www.easymusictheory.com/lessons.html
http://www.creatingmusic.com/
http://pbskids.org/chuck/index.html#/jazz
http://www.anvilstudio.com/