Homebrew developer joek2100 has come out with a new beta version of Music prx. For those who haven't heard of it, Music prx is a custom firmware plugin that lets you play music on your PSP while running games and using the vsh.

There have actually been a couple of changes since the v0.50 release, so we've got the comprehensive changelog for the versions 0.51 to 0.54:

* 0.51: (beta)
o Fixed a bug which would prevent playback in some games (You can now remove hw.prx, it is no longer used)
o Since many people are reporting problems, I made this a "beta" version, I'll try and fix the bugs as soon as I can, see me last post in this thread for details
* 0.52: (beta)
o Fixed a bug which prevented some (I guess a lot) of atrac3 files from playing properly,
* 0.53: (beta)
o Fixed another bug making atrac3/atrac3 plus files not play, please update to this version before reporting any bugs, if you still have problems
* 0.54 beta:
o Removed the settings file because it was causing a problem
o Added those settings into music_conf.txt
o NOTE: In 3.40OE (and possibly other fws), setting the cpu speed > 222 will cause the vsh to not work/crash
o This seems fixed in 3.52 M33-2

Users will definitely want to check out the included readme for instructions on installing the plugin as well as information on how to use it. In any case, give this plugin a try and see if it works for you. Enjoy!