Bill Graham invented "The Sound" to call to mind the home-brew, local San Francisco bands that he featured at his venues. In BG029, Wes Wilson captured the curvaceous female form in one of the best examples of his work.
The 2nd printing postcard was printed after the concert and has a "West Coast Lithograph" credit on the reverse. The orange is a bit more muted, the green darker, and outline of the woman a bit more blue. It measures 4 15/16" x 8 3/4".
The 3rd printing postcard matches the 3rd printing of the poster. It displays a "Creative Litho" credit, a brighter orange, a lighter green, a more purple outline, and it measures 4 7/8" x 8 1/4". It was also printed after the concert.
This 4th printing postcard (see BG029-4) matches its respective poster, with red, blue and gold colors. It measures 4 3/4" x 8 1/8".
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.