I have a slight issue with My Music and additional songs, and I'm not sure where else to ask this...
All of the songs appear in-game and I can set their likelihood just fine, but any song after the 20th on a single stage don't save. For example, I have 25 songs on Final Destination (13 default and 12 additional). While the first 7 of my additional will save my likelihood settings, the remaining 5 will always revert back to no chance upon leaving the game.
It's a minor inconvenience, sure, but I would still like to fix it if at all possible. I imagine it's possible as an actual in-game stage has 27 songs and saves just fine (Super Mario Maker).