According to a piece in NewScientist, a group of compscis at Helsinki University have developed a system to add a fitting soundtrack to your next air guitar solo. The system uses computer vision to monitor hand placement/movements and to play fitting guitar riffs to go with them (one would assume making adjustments for utter lack of talent — which would be why you’re playing air guitar in the first place). The piece has a link to a video demo. Oh, the humanity!
Thanks, Jay!