This is the revolutionary piano app to support the practice of playing chords. This app can display each note of the component tones (root, triad, 7th, tension, on chord) of selected chord on the keyboard, play chord sound. In addition, it has 6 octaves keyboard, and it can display immediately the chord name to match the configuration notes you pressed. As the main features of this app, it has the function to play chords as sequencer of 16 bar. This app supports you when you practice the songs