At Fillmore East June 27, the Fillmore East closed, and the band were invited to play a final, invitation-only concert, along with Edgar Winter, the Beach Boys and Country Joe McDonald. The Beach Boys initially refused to perform unless they headlined the event, but Graham refused, telling them that the Allman Brothers would be closing the show, and they were free to leave if they disagreed. The Allman Brothers' performance was used for additional tracks when an expanded version of "At Fillmore East", "The Fillmore Concerts", was reissued on CD. "At Fillmore East" showcases the band's eclectic mixture of blues, rock, country, and
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