I use IRShell it works.
EDIT:
How to setup:
Download and place it on your memory stick
Start it, directory view, irshell folder, patch folder, your firmware folder,and install the btcnfpatch.prx so that you can start games.
Then use the directory view or something to start the music, and start the game.
L+Select will bring you back to the irshell to change the song if you want or something