In the Tap Tap series, I found that when you download a song, it is stored as a plain audio file. I'm not sure if it would be legal to extract this song and use it outside the app, but I see nothing wrong with it. I mean, I paid hard earned money for the download, and the download consisted of the song. That's like if you pay $20 for a casino game on a computer, and then use the icon for your own use. It's not what it's meant for, but part (or in TTR, most) of the money you spent on it went to that component. But legally, I'm not sure. Does anybody know? I did try searching, but "Is it legal to use music tracks from video games?" doesn't bring up many results.