Just wondering (and, maybe, a new idea for those t-shirt makers ) ..... do you have seen those t-shirts with EL glowing elements in the draws ? ..... some acts as vu-meters, some reacts with wi-fi fields, and so on .....
Now, what about some t-shirts with a draw representing a lasershow (something decent, not a crap image), with EL glow elements painted in the beam paths, that react with the sound level, illuminating more / less, or in different patterns, the beam draws ?
i'm not sure if i understand but yes the shirts i link to do the EL glow does "dance" to the music. or you can just set it to do random. it is a basic programable circuit with a mic to pick up the surrounding music. i bought one for my ex a while ago. it works great.