Make your own tune!
That's right, after you get the latest version of Flash, you'll be able to use the SFS Composerizer to make your own tune.
You drag and drop the measures onto the staff, in any order you like. When they're all in place, you can play your new tune.
If you like this game, you're not alone. Back in the late 1700s many important composers, including Wolfgang Amadeus Mozart, created composing games like this one and people have been playing them ever since.