Grace Slick was still a member of The Great Society when they shared this billing with Jefferson Airplane and the Heavenly Blues Band. The margins of the poster cannot restrain the irresistible force of the music.
The pre-concert 1st printing bears union logo 72 in the lower left corner and measures 14" x 20".
The 2nd printing bears union logo 183 in the lower left corner and measures 14 1/16" x 20". It was printed in 1967, after the concert.
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.