I'd like to rip the music from the GameCube version of TimeSplitters 2 which has beta/unused songs.
Here's a sample of one audio file using the format:
http://www.mediafire.com/file/64nzsredz1t3f0i/ts2_game_over_lose_44_fx3.mss
EDIT: Found a way to rip these, I used VGMStream to convert the samples.