Another thought to file in the "intersting" category is each time I've been to SF if you go down to Market Street after dark, say 9pm the musicians come out, typically between 4th and 5th streets. One time I saw an amazing drummer doing solo's, and another a guy brought a honda generator and a mixing board, turntable and speakers and was mixing dance music on the sidewalk. The restored streetcars run the F line down Market street and out to the Castro, so that adds some interesting colour.