Did you guys know that Capcom actually used the latest Street Fighter II OCRemix album as the in-game music for their Street Fighter II HD re-release? Hot damn. Hot diggity damn.
But US copyright law seems especially friendly to music. For example, it's possible to invoke a compulsory license to music whose author can't be readily found, subject to fees set by some kind of board the US government maintains. The royalties go into a trust fund, and if the author is found, the author gets the monies. How awesome is that?