Meet the Yamaha Sonogenic SHS-300 Keytar: a wearable electronic keyboard that combines with your smartphone to let you play music even if you are not an experienced musician. You can use it like a regular electronic keyboard but when combined with your iOS/Android device through Chord Tracker app, you can play without worrying about missing a note.
Chord Tracker analyzes the songs in your library and creates a chord chart for them. The keys are then remapped to the keyboard, so no matter what key you press, you will be hitting the right cord. The SHS-300 has 12 instruments for you to choose from (piano, guitars, organ, bass).