It's relatively easy, really!
![big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
1.) Make a Backup of the music file you want to replace (just Ctrl+C -> Ctrl+V should be fine; just make sure you wrote down the original file's name somewhere.)
2.) Go to
here, select the game you want a music track out of and download the specific .bfstm file.
3.) Now delete the original file
not the backup, copy the downloaded file to "<MK8>/vol/content/audio/stream/" and rename it to the original file's name!
![smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
They used a very straight forward naming for these files, so you'll know which one is which!