Yup, the music scene in SF is pretty much in limbo right now, if not completely gone. The tech industry has made it impossible for musicians to live there. Most come from the East bay, where rent isn't a nut, a leg, and forearm...but not far from it. DJ's and sequencers have pretty much taken over.[/QUOTE
There is not much difference in the cost of living between the east bay and the peninsula. In fact, some areas are even higher in the east bay than in the city.
There are a lot of musicians that are part of the tech companies btw. I dont recall a lot of music stores ever in the bay area, but in turn I think that the bay area in general has been more more internet savvy over the years for the same reason, all the high tech, which leads to less sales locally.