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
Humble Pie was released to coincide with the album and failed to chart, however the band was becoming known for popular live rock shows in the US. On July 9, 1971, Humble Pie opened for Grand Funk Railroad at their historical Shea Stadium concert, an event that broke the Beatles record for fastest selling stadium concert, to that date. Also in 1971 Humble Pie released their most successful record to date "Rock On" as well as a live album recorded at the Fillmore East in New York entitled "Performance Rockin' the Fillmore". The live album reached No. 21 on the US "Billboard"