Buffalo Bell
Rabby
Sometimes when you exit a Hall of Memories fight the theme from the fight is still playing over the normal theme, then if you enter a fight both fight themes play, if you exit to menu both the fight them and the menu theme are playing. There are two solutions to getting the fight music to stop, enter and complete another Hall of Memories fight (it might have to be the same one) or restarting the game. I don't know what happens if you just wait it out but I could test that if you want.