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 Betts and Allman trade long guitar solos, with one of Betts' solos quoting what would later become the main theme for the song "Les Brers in A Minor," as featured on the band's 1972 album "Eat a Peach". The song closes with "long, sustained notes" from Allman opposite Trucks' kettledrum. Applause concludes the album and the song fades out. During the fadeout, Trucks begins playing the tympani intro to "Mountain Jam" which would not be released in its entirety until its inclusion on "Eat a Peach". The band devised the cover idea for "At Fillmore East" rather than leaving it