At Fillmore East jazz. "Fusion is a term that came later, but if you wanted to look at a fusion album, it would be "Fillmore East". Here was a rock 'n' roll band playing blues in the jazz vernacular. And they tore the place up," said Dowd. Announcer Michael Ahern opens "At Fillmore East" with a simple introduction: "Okay, the Allman Brothers Band." Duane Allman biographer Randy Poe describes it as "the only low-key moment over the course of the [show]." The cover of Blind Willie McTell's "Statesboro Blues" which opens the set showcases Duane Allman's slide guitar work in open E tuning.
At Fillmore East nights. Promoter Bill Graham enjoyed the band and promised to have them back soon. In January 1970, the band opened for Buddy Guy and B.B. King at San Francisco's Fillmore West, and one month later at Fillmore East supporting the Grateful Dead. According to biographer Alan Paul, "these shows were crucial in establishing the band and exposing them to a wider, sympathetic audience on both coasts." Drummer Butch Trucks considered their performances at the Fillmore East to be the launching pad for their success. In 1970, Duane Allman told disc jockey Ed Shane, "You know, we get kind of frustrated