Blob Chorus (ear training game)
Body Synth (With the help of your computer's camera, this website turns your body movements into sounds.)
Carnegie Hall Listening Adventures (Ollie and Violet in the Jungle)
Google Doodle-Clara Rockmore-Theremin
Google Doodle-Fischinger-Visual Music Maker
Google Game-Assisted Melody-Bach/Beethoven/Mozart
Google Game-Blob Beats-Tap the keyboard in time with classics
Hansel and Gretel Interactive Opera
Instrument Information and Embouchure Tutorials
Instrument Sorting Game at Brainpop
Nutcracker Interactive Storybook
Seeing Music (Experiment with what sounds look like.)
The Science of Music at the Exploratorium