Battle of the Bands is a bonus section in Rhythm Heaven which is unlocked after the player has completed Remix 10. After that, the player can access the section by tapping the right-most part of the blue ribbon in between the minigame sections. In there, an ad tells you to sign up for "Battle of the Bands". There are two buttons, "Beginners Enroll" and "Pros Enroll". To enroll, one must first complete all the Guitar Lessons in the Basic Course or the Technical Course in the Medal Corner each with at least an A Rank. Then, the player can enter either the Beginners or the Pros game depending which course was completed.
Each game consists of the Rockers with the camera behind them instead of in front of them allowing the player to see the audience, which includes almost every character in the whole game, as well as the game's staff hiding in the corners. The player cannot lose in this game and even if they did well, the Rockers will be put in either 1st, 2nd or 3rd place in the Battle of the Bands results. Aside from that, nothing else in the game actually changes. In the Beginners game, the player plays all the songs from the Basic Course in order, and in the Pros game, the player will have to play all the Technical Course songs, as well as "that one song" at the end.