For those who don't know, the mysterious composer was Nick Jonas.
Here's something I have to say to those that will complain.
RELAX! Don't quit the game because of a pop celebrity's appearance.
1. I like Nick Jonas. He's nice and talented.
2. Unlike Justin Beiber, he can sing his age.
3. He has diabetes. Cut him some slack.
Thanks for stopping by, Nick! :)