Gregg was the fourth member of the band to die, but the first of natural causes—though his past lifestyle certainly contributed to those causes. I say American music pioneer because categorizing him in blues, rock, or especially Southern rock is pointless. Allman's influence goes far beyond Lynyrd Skynyrd and Phish. The Allman Brothers was made up of only one Allman brother, Gregg, far longer than not, and the group has re-created itself and been reborn at least twice, and very successfully.