Like vinyl records, hair metal and Ricky Martin, the world of rock art - album covers, posters and the like -- just doesn't score as much attention as it once did. These days, the few non-video visuals that remain part of the music experience usually get shrunk down to fit on an iPod screen, if they show up at all.

One holdout that's not only still alive, but thriving, however, is the custom designed concert poster. So many shows, so little time? Here's a look at the 25 coolest posters in rock history. And yes, it's undeniable: San Francisco figures prominently.