It also provides live visualisation of the pieces that are being performed. There is no score keeping, the user is free to perform the music in any way they wish. The premise is that it is really fun to perform a piece you know well, exactly like you feel it with so little effort.
Some of the highlights from the included pieces:
Debussy - Clair de Lune
Beethoven - Moonlight Sonata (All movements)
Erik Satie - Gymnopédies (1, 2 and 3)
Chopin - Most popular pieces, and all 24 preludes
Bach - Well Tempered Klavier Book 1 (All preludes and fugues)
Beethoven - Pathetique Sonata (All movements)
Rachmaninoff, Liszt, Brahms and many, many more! Playing them is extremely fun, and no prior musical skill is needed. Give it a try and you'll see.