ynohtna wrote:
There's a free game called Bullet Philharmonic Orchestra which does something along these lines, although without much success in my judgement.
I've been thinking about having audio-related bullet storms for many many years, but it's a lot of work and I am now moving onto other areas of greater personal interest.
Hey, how about
you code this up? I think it would be cool, and the sources for some of this are already available.

Someone posted an interesting concept on the old Edge forum in a similar-ish vein, I wish I'd saved it now. The basis of it was a Space Harrier type shooter with a ground surface which morphed and undulated in time to the beats and spot FX, so if you went through a quiet section of the game the floor would stay flat until the audio started to interfere with it. Obstacles on the ground increased in frequency as more layers of audio were added, so you'd travel through relatively flat sections and then be thrown into chasms and valleys until the sound calmed down again.
I thought there was real potential in that, obviously it's inspired by Vib Ribbon and Rez but I don't think I've seen it done in a shooter, Unity may be close to it if the surfaces are hazardous though.
Edit: Bullet Philharmonic Orchestra is the best game title I've ever heard.