A new app made by developer Graham Parks adds a bit of whimsy to the MacBook Pro’s Touch Bar. Called Touch Bar Piano, the app turns the MacBook Pro Touch Bar into a small touch-based piano. It’s completely polyphonic and offers 128 instruments for you to make music with. If you don’t have a MacBook Pro but want to play around with it, the app works with emulator Touché. You can download the app from his site.