Google says it’s launching Song Maker in concert with Music in Our Schools Month, an initiative of the National Association for Music Education.
Once you created your masterpiece, Song Maker gives you a permalink so you can easily share it with the rest of the world. While you’re at it, also have a look at the other instruments in the Music Lab. The Kandinsky translates your drawings into music.
And once you have graduated from Sound Maker, there’s all kinds of more complex browser-based sequencers that you can experiment with, too, including the likes of Soundation. Sampulator and Acid Machine.