This app is a simple and fun way to learn the melodies of a lot of famous Christmas songs. I've been playing the piano for 15 years, but this app presented a challenge because you are not reading music, but pressing notes to a rhythm that is sometimes hard to determine. I'm using a kindle fire (first generation) which operates on a two-point multi-touch system, meaning that it can only register two pressure points on the screen at a time. This is a pretty severe issue for this app and others like it because most of the songs require you to play three note chords, which my kindle cannot do. If there were a "chord toggle" option to let you turn off the three note combinations and give you a two note equivalent, this app would be much better. The addition of a metronome or other rhythm/tempo signifier would also be fantastic so you know the pace of the song.
In short, if you have a first generation kindle fire or other device that uses a two-point multi-touch, don't bother with this app unless you are willing to accept the poor scores you will receive on songs because you cannot play chords.