www.incredibox.com Create your own songs!
www.musictechteacher.com Has SO MANY music quizzes and games!
www.nyphilkids.org NY Philharmonic Orchestra has lots of games and activities in their Kidzone.
www.mollymoccasins.com Molly Moccasin's Orchestra Adventure story.
musiclab.chromeexperiments.com See, create, and listen to music using these chrome experiments.
www.makingmusicfun.net Worksheets about rhythms, note names, composers, etc.
www.classicsforkids.com Games and activities all about classical music. They also have a great podcast!
"The Music Show" has lots of episodes on YouTube for you to learn all about rhythm, melody, dynamics, tempo, and more!