I guess the music act(s) do their thing on Saturday night, starting after the drift shows and F1! shows. During a show and shine ricer contest thingy perhaps, nicest pair of headlights or something. The rest of the time it will be a man, hitting a button in some software playing rhythmic mp3's, with an accent on bass and repetition. Or a woman of course. Those can shout 'let me see those hands' too, quiet convincing.
Rock Concert Movement # 2. Raise the Roof.
https://youtu.be/VIVwKtbKDQA