La Touche Musicale allows you to learn the songs you love on piano. Connect your MIDI keyboard to your device and learn very quickly.
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Flowkey - The easiest way to learn piano with your iPhone or iPad
Yousician - Learn to play music at home, at your own pace
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Guitartapp Chord Pro - Guitartapp Chord Pro is the world’s largest and popular music and audio app that allows you to throw away your songbooks and start jamming with this app.
Synthesia - A fun way to learn how to play the piano.