I managed to dl some songs to the sd and play them just fine, the problem is that when I play any song it saves a copy on the wii memory. So, after playing 3-4 songs my wii memmory is full and says that I need to delete something, besides for some reason I can't delete the songs from the rock...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced