The writer of folk-rock standards "Do You Believe in Magic" and "Summer in the City" with his band The Lovin' Spoonful, John Sebastian appeared at the Fillmore West with former Electric Flag member and frequent Jimi Hendrix collaborator, Buddy Miles.
The poster was only printed once before the concert. It measures 14" x 21".
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.