Most of the music is made up of existing songs sampled for the boxing matches. (comingsoon.net)
What kinds of creative decisions were entailed in arranging previously existing songs for the expanded console version of the game? (gamesetwatch.com)
Though these re-use existing songs, there are often extra goals required to succeed, like achieving a specific note streak minimum, and you're often rewarded with valuable equipment. (newgamenetwork.com)