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
Hampton Grease Band cult following, and was re-released on CD in 1996 with several minutes of additional material that had been edited off the vinyl release. The band was the lead-off band for Frank Zappa/Mothers last appearance at the Fillmore East on June 6, 1971. It was at this concert that Zappa and the Mothers recorded part of the "Live at the Fillmore East" album. Later that evening they were joined by John Lennon and Yoko Ono, also available in recorded versions. Lead guitarist Harold Kelling died in May, 2005. The Hampton Grease Band held their first reunion concert on June 2, 2006,