The Music box versions of the K.K. Slider songs are the only in game versions of the songs that aren't available at the moment. Adding them would mean having three versions of every K.K. Slider song, but if that's willing to be done it could be a neat addition.
The Music box versions of the K.K. Slider songs are the only in game versions of the songs that aren't available at the moment. Adding them would mean having three versions of every K.K. Slider song, but if that's willing to be done it could be a neat addition.