This guide will show you how to enable the classic soundtrack
Enabling the classic soundtrack
1.) Purchase the Super Monkey Ball Banana Mania – Classic Soundtrack from the steam store
2.) Install it
3.) Launch Super Monkey Ball Banana Mania
4.) Go to options
5.) Under the cog icon there should be an option labeled “Change Music”, switch that to “Original”
6.) Enjoy the game with more nostalgia
Thanks to Mountain Man for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.