With their appearance here, the popular pop-rock Turtles became one of the few non-San Francisco bands (they hailed from L.A.), to appear at an early Bill Graham concert. Heinrich Kley contributed the artwork to Wilson's design.
The pre-concert 1st printing of the poster shows union logo 72 in the lower left corner and measures 13 15/16" x 20".
The 2nd printing, produced in 1967, bears no union logo, but has the words "Printing by West Coast Lithograph Co. SF" in the lower left margin. It measures 13 7/8" x 19 3/4".
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.