In the Streets of Rage 1 soundtrack, both versions of the song titled Keep the Groovin aren't working. I'm pretty sure it has something to do with the extra hyphen at the end of the song title...

downloads.khinsider.com/game-soundtracks/album/streets-of-rage/23-keep-the-groovin-.mp3

downloads.khinsider.com/game-soundtracks/album/streets-of-rage/08-keep-the-groovin-.mp3