Better than you'd think
I only gave it an 8 because of the strong possibility that it could lose its appeal over a long time. Also, I found myself disappointed with the piano game. I don't mind the simplistic nature even though I'm a piano player (pianist sounds too formal) but the timing seems a bit off to me and it feels awkward. I'm not sure if this carries over to people who don't play piano, though.
One hugely important plus: The touch screen understands my writing 99% of the time, and believe me, THAT is saying something.
If you take the price into account, this game is definitly worth your money. The only type of person I wouldn't recommend this to is an adrenaline junkie. If all your favourite games involve blowing up buildings and high-speed car chases, this one isn't for you. Otherwise, go grab yourself a copy!