At Fillmore East During this time, the group began struggling with drug addictions. Everyone in the group, with the exception of the brothers, was also struggling to make a living (vocalist Gregg Allman received more money from royalty payments and Duane more from session work). In one incident, tour manager Twiggs Lyndon stabbed and killed a promoter for not paying the band; he later claimed temporary insanity. Their fortunes began to change over the course of 1971, where the band's average earnings doubled. The Allman Brothers Band had first played Fillmore East in December 1969, opening for Blood, Sweat & Tears for three
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