Chrome Music Lab
(https://musiclab.chromeexperiments.com)
Google Chrome created this website for "Music in our Schools Month". It is a collection of experiments/games/activities where anyone, at any age, can explore how music works!
The Wide World Of Music
Click on the picture of the instrument and it's sound will play!
Classics For Kids Podcast
(http://www.classicsforkids.com)
This is a weekly podcast by NPR. It will introduce you to musicians you may or may not have heard of before. There are also music games and activities that you can play on their site.
Isle of Tune
Build you own roads, add houses, trees, and lights to take a tuneful trip through your own musical neighborhood!