Any musicians fly with a metronome? Theoretically, any maneuver could be memorized to be performed nearly identically every single time.

No, interesting idea though. When I teach snowboarding to musical types I often have them time their movements to their mental metronome/stereo.... maybe something to this.

I do find that timing plays a big role while flying freestyle at least, Makes it really easy to add music and make a sick edit

Would be possible flying in open air, but as soon as you introduce object that you're flying around, speed of the quad becomes too much of a factor.

It would be an interesting concept though to see how you fly in 4/4 or 6/8 and even compare to uncommon meters.