Wes Wilson returned to the Graham stable for two more posters, BG150 and BG151. Both of them faces, BG151 was Wilson's characterization of Bill Graham, "... rich and smug like an antique Roman merchant." Needless to say, BG151 was the artist's last poster for the Fillmore.
When the Avalon Ballroom and Bill Graham's Fillmore Auditorium began to hold weekly dance concerts, Wilson was called upon to design the posters. He created psychedelic posters from February 1966 to May 1967, when disputes over money severed his connection with Graham. Wilson pioneered the psychedelic rock poster. Intended for a particular audience, "one that was tuned in to the psychedelic experience," his art, and especially the exaggerated freehand lettering, emerged from Wilson's own involvement with that experience and the psychedelic art of light shows.