Simply Piano - Fast and fun way to learn piano
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
ChordPic - Create beautiful guitar chord diagrams
Yousician - Learn to play music at home, at your own pace
Hyperlax - Sit back. Relax. Explore faraway places. Enjoy the music.