It's only doing us favours to branch out and let people know where to get into contact with issues like this!
Even with our fairly large moderation team, we don't have a complete list of all copyrighted tracks on the face of the earth, and especially in the low-profile cases such as plagiarizing freely released music, normally the few people that notice have no idea how to go about getting the problem solved. There are likely a hell of a lot more than a half dozen stolen uploads a year on NG, today alone I've banned about 10 users...
Haha, thanks!