I think it would be nice to be able to change the chocobo companion's music to any unlocked orchestrion track. I like how much customization there is for how the chocobo looks but riding it around gets annoying with the same old chocobo music playing. I could turn off the mount music but if I have to choose between a trial mount with great music or a great looking chocobo with no music, I will always choose the mount with music I like. I also am traveling more than I am sitting in an inn or an estate, so being able to listen to tracks I've collected while moving between quests would make collecting the orchestrion tracks feel more meaningful.