Extratone is known as the fastest music genre, where bpm exceeds 1000 BPM and kicks are so fast they blend together producing constant tone. I've seen some songs going up to thousands and meme songs pretending to be something like e+123. It's probably a bullshit since youtube is going to encode it in much lower sample rate basically discarding most of the information.

But what is the fastest BPM that makes physical sense? Will it be somewhere where uncertainty kicks in or light speed limit?
Air might be too sparse to be able to propagate the sound, but crystal structures or nano structures should be more suitable.