I know this is not what the OP has in mind... but my D loves musicals, and I have started giving her piano books of musical and movie music (just gave her Aida for Christmas). She (who disliked piano lessons before she quit them) loves to play these. She has mastered some quite difficult Lord of the Rings and Phantom of the Opera music in the last year. She now goes and plays to take a break from studying. Absolutely no one is timing her practice, but there are days when she spends an hour on it (I sometimes have to ask her to go study her schoolwork, and suggest that she reward herself after 45 minutes of study with more piano time!). I enjoy listening, too smile