I am THRILLED with this app. I already can read music, but am trying to learn chords so I can play "fake" books, which have the melody and chord identified. I found a PC program like this sold by an online piano teacher for $39, and am not even sure it would work with my Mac or iPad. Instead I downloaded this. The graphics are clear. You can choose seemingly any possible, imaginable chord, and find out how to play it. The piano keys are clearly shown, and the chord plays either as a chord or arpeggio so you can heat it. FABULOUS! I am an adult student at the Jazz School in Berkeley, and chords they teach in class are scribbled on the board, so I worry about getting it written down correctly. here it is! Just put the iPad in the music holder on the piano and the mystery is gone. I would give it more than 5 stars if I could.