considering there are problems with red kawa's great application
etc
i have just found this
http://www.finetune.com/wii
its great for music on your wii...
to make your own playlists
just go to finetune.com
and then register
then go to "create a playlist"
it will tell you what to do
(you can only have 3 songs from one artist in each playlist)
(EX: i have 3 trivium songs, and 3 lamb of god songs in one playlist)

-BrasssMunkye