Music Playing Blocks
It's hard to make decent music by just bouncing on music blocks, so maybe there could be music player blocks. You place music notes in a line and place the bumper on one end. when you bump it, it will play the blocks. There can be fast ones and slow ones. When you place them next to each other they can become connected so you can have a more complex tune. You can place basic bumpers to provide a pause in the music. And unless you hit the bumper the music will keep repeating. I've thought about this awhile, hope you like it!