You can turn off all the music by changing the name of the Miles folder.
Right click the shortcut, go to Open File Location, add a letter to the file called "miles" (called mine "Smiles"
). No more music.
It's very quiet in game like that, but it seems like the music always starts up at the worst times, like right when you're the last person or when the time is about to run out and you're running around.