There's a app in the market called "Rock Player". There's a few different verions for different hardware, but I think it's free so if you pick the wrong one you can always install another version.
I've got Rock Player but when I open it it just shows all of the folders in my phone...
Also, how do I know which version to get?
Where do I look on my phone for the processor information? ARMv7? ARMv6?