Add support MP3 as BGM

[onelight]

log2 this instruction

Hmm, odd...
It looks like it can't find the MP3 folder. Could you please check if your friend did the following:
- Open ms0 folder;
- Open PSP folder;
- Create a new folder called MUSIC (must be capitalized, "MUSIC" and not "Music");
- Place the MP3 files inside this folder.

Thanks!

log3 also do in ms0\MUSIC

Both case still can't find the mp3 file.

what is different between "ms0\MUSIC" and “ms0:/MUSIC” ？
I text AKB 1/48 and found this in log :

14:38:54 INFO hle.IoFileMgrForUser - SOUND:STRThread - hleIoOpen filename = ms0:/MUSIC/AKB48/AKB48-君について.mp3 flags = 1 permissions = 00
14:38:54 INFO hle.IoFileMgrForUser - SOUND:STRThread - hleIoOpen filename = ms0:/MUSIC/AKB48/AKB48-桜の花びらたち.mp3 flags = 1 permissions = 00