I'll get straight to the point, a big part of why I love this game so much is the atmosphere, and a big part of that is the music.

I think this game could really benefit from having the ability to change when/where certain music tracks start playing, for example being able to play Heaven*Up during races or during GameBall matches (I spend far too much time in the HQ listening to it because it only plays there).

And also having the ability to add custom music could only be beneficial to this game.
I mean most of Hideki Naganuma's previous music is already perfect for this game, so not having them here as well just feel like a missed opportunity.

I think alot of player would get really happy if this feature got implemented.

Keep up the good work!