I have seen a music video with a girl that is playing piano which continually moves. The piano moves with the girl still playing on her seat. Although she is sitting down, the seat is connected to the piano so she moves with it. I do not know which song this is. The girl is aged 18-22 and a brunette.
Would it happen to be, Vanessa Carlton.
Music video: A thousand Miles?
http://www.youtube.com/watch?v=pnkvhi1XOR8