Simply Piano - Fast and fun way to learn piano
Touch Bar Nyancat - Nyancat on your MacBook Pro's Touch Bar #innovation
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Pock - Display the macOS Dock in your Touch Bar
Yousician - Learn to play music at home, at your own pace
Joytunes - Learn music through mobile games