Gregory LeNoir Allman was born in 1947 in Nashville, Tennessee. Along with his guitarist brother Duane, he moved to Florida during the mid-1960's and played in a band named after themselves, the Allman Joys. They later relocated to Los Angeles and formed a band called the Hour Glass, and still later moved to Macon, Georgia to form the Allman Brothers Band. The original lineup also included guitarist/singer Richard Betts, bassist Berry Oakley and two drummers, Butch Trucks and Jai Johanny Johanson, known as Jaimoe. After the band put out two successful albums, Duane Allman and Oakley were each killed in a motorcycle accident. They regrouped with Lamar Williams on bass and Chuck Leavell on piano. The band, in various incarnations, would continue until 2014. Its members have included guitarists such as Dan Toler, Warren Haynes and Derek Trucks (Butch's nephew), bassists such as Allen Woody and Oteil Burbridge, drummer David Toler (Dan's brother, who briefly replaced Johanson), and percussionist Marc Quiñones. Besides organ, Gregg Allman would occasionally play piano and guitar. He also had a side project called the Gregg Allman Band.
Allman had five children, including singer-guitarist Elijah Blue Allman, whose mother is pop singer Cher. Read more at Billboard, CNN, Rolling Stone, Ultimate Classic Rock and TMZ.