The rules say:

1. Illegal media resources are not allowed.  (Media resources mean sounds, sprites, music themes, etc.)

Does this include royalty free music? Kevin Mcleod has a lot of free music on his site, free for anyone to use, with credits. A lot of the old Xbox Indie games used his music.

My game is about 65% done and I need a music track, so I'd like to use one from his site, crediting him.

Is this allowed? He's quite happy for people to use his stuff. But I wasn't sure if the games we make HAVE to only include our own created materials. Because I suck at making music myself. :(

Hello!

 Of course royalty free music, royalty free sounds and royalty free sprites are allowed.

"My game is about 65% done" <== Wow! Excellent! 

Thank you! It's now about 80%. I just need to polish it up, add the audio, and I might even be able to hand it in tonight.