This happens to me, too, from time to time. Pretty simple fix actually. Run Gecko without ANY codes on but this one. Seriously, not even the File Patch Code (Precautionary but I really doubt it'll hurt anything).
Battlefield My Music Reset :
4A000000 9017EBCC
14000000 000026FC
14000004 00000032
14000008 000027EE
1400000C 00000032
14000010 00002711
14000014 00000032
14000018 00002813
1400001C 00000032
14000020 00002815
14000024 00000032
E0000000 80008000
Use this if any other stage's My Music menu starts to freeze up, it has the codes for the other stages:
http://www.smashboards.com/showpost.php?p=7292093&postcount=2Also, if you use Riivolution, I'd set up a savefile redirect so that this doesn't happen again. If it happens in your hacked savefile, it won't touch your normal save and you can just replace the savefile. If you have Gecko, it just isn't possible. Here's a link to a savefile with instructions on how to set up a savefile redirect:
http://www.smashboards.com/showthread.php?t=301354Hope this fixes it for ya.