Chicago headlined The Guess Who, a moderately popular Canadian rock band that spent time after an unsuccessful British tour doing Canadian television, and soft-rock duo Seals and Croft. Singer's collage was an unsettling statement of patriotism superimposed on what could be seen as bird's-eye-view of Southeast Asia.
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.