By the summer of 1966, Bill Graham had turned the Fillmore Auditorium into a machine that ran every weekend, and the posters announcing each bill had become small works of art in their own right.

This one, BG-11 in Graham's numbered series, advertised the Wailers and Quicksilver Messenger Service on June 17, 1966. The art was by Wes Wilson — the designer who, more than anyone, defined the visual language people picture when they think "psychedelic poster": the letterforms that swell and melt and vibrate, packed edge to edge until the type itself becomes the image. A year earlier, the Charlatans had lit the fuse out in the Nevada desert with hand-drawn Victorian lettering — the Seed; here at the Fillmore, Wilson was building the style that the whole movement would wear.