[tmandry]

I used to be a sound engineer for live shows. I could imagine high speed cameras being used to replace instrument microphones in live performances one day, much like optical mice replaced the roller ball style.

By keeping a fixed object in view of the camera (e.g. a reflector on the stage), a camera could correct for its own vibrations and achieve perfect rejection of outside noise, unlike most microphones which have a cardioid pattern.

Probably a pipe dream, but cool idea.