San Francisco has a fine tradition where, on a given Sunday, the city limits the main drag of a neighborhood to human powered traffic only. It was the Mission's turn last Sunday (7/31/13). The sky was grey but it was a fine event anyway. (Please click.)
Kids and parents could walk down the center of the street.
And bikes could be ridden without fear of traffic.
Turns out there is a wonderful tradition of lowrider bikes in the Mission.
And some of them are music machines.
This is clearly not any sort of lowrider. It was powering a DJ table set up next to it. I do admire the portholes.