The habit of presenting two different billings on the same poster made it unnecessary for the artwork to relate directly to any of the bands. BG180 was the artist's visual pun with "two-lips."
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.