By late 1969, Santana could be counted on to attract a crowd, and Bill Graham added less familiar groups to the billing to take advantage of Santana's draw. Grand Funk Railroad was a Michigan transplant, hard-rock band that built up a following with constant touring; Fat Mattress, formed by Jimi Hendrix Experience original member Noel Redding, played progressive rock into the 70's.
The poster was only printed once before the concert. It measures 13 3/4" x 21 15/16".
The 2nd printing is on coated matte stock and has "W 2022" in the lower right hand margin. It was printed in 2022 by Wolfgang's in a 100 copy run. This reprint measures 14" x 22".
During his Fillmore era, from 1969-1971, Singer created more posters for Graham than any other artist. Singer's posters are notable for his use of collage, incorporating thousands of images clipped from magazines spanning several decades. He developed a format that included a stunning variety of lettering styles, applying them in close relation to the theme or subject of a poster.