http://www.effect.net.au/geeen/music/PBrosmusic/
http://www.effect.net.au/geeen/music/PBrosmusic/Boss1_Marx.it
http://www.effect.net.au/geeen/music/PBrosmusic/PB_level.it
http://www.effect.net.au/geeen/music/PBrosmusic/meta_RMG.it
http://www.effect.net.au/geeen/music/PBrosmusic/meta_Travel.it
http://www.effect.net.au/geeen/music/PBrosmusic/PB_chink.it
http://www.effect.net.au/geeen/music/PBrosmusic/PB_level_train.it
http://www.effect.net.au/geeen/music/PBrosmusic/total_victory.it
The only one I listened to was Boss1_Marx. It was a little boring as a "stand-alone" song, but it fits the game style, I could see it used in a game. The melody in the beginning sounds a little familiar too.
I didn't listen to any music but the game sounds like a lot of fun. Be sure to post a link when it's done.
Interesting. Listened to the first and last song. You like key changes, don't you? Maybe I should change key more often too. I might listen to the other songs soon.