The shows around here are usually inhabited by yungans with those BOOM BOOM stereos driving people crazy (which I'm sure is the purpose). I've often wondered if those audio systems could play music :)
There would be no point in playing music. They are all deaf by now anyways.
(In Tucson there was a regular weekly? monthly? all-makes parking lot show -- with that godawful 50's CRAP noise (I'll take the boom cars any time) -- but it got import scene kids, lowrider bicycles, trucks, rich white grandpas with the usual shiny hot rods, lowriders with aircraft-quality hydraulics, you name it. It was great!)