History has tended to overlook the festival that was bigger than Woodstock, Monterey or the Isle of Wight.
'At Fillmore East' cemented the band's live reputation for delivering incendiary southern rock.
Gregg was born on 8 December 1947 in Nashville, one year the junior of brother Duane, with whom he would co-found the mighty blues-rock institution the Allman Brothers Band.
Lynyrd Skynyrd and other bands who created the original southern rock explosion will be performing next January in the 2018 Southern Rock Cruise.
Butch Trucks, who co-founded The Allman Brothers Band in 1969, passed away on 24 January, 2017 aged 69.
Next year's third edition of the Keeping The Blues Alive At Sea “floating music festival,” co-presented by Joe Bonamassa, will feature Gregg Allman.
'Enlightened Rogues' included original material such as Dickey Betts’ ‘Crazy Love’ and a cover of B.B. King’s ‘Blind Love.'