The Allman Brothers Band, formed in 1969 in Jacksonville, Florida, helped define Southern rock with bluesy improvisation and dual guitar harmonies led by Duane Allman and Dickey Betts. Their landmark live album At Fillmore East remains a touchstone for jam-band fans and classic rock playlists.
The extended jam "Mountain Jam" is based on Donovan’s "There Is a Mountain" — the Allmans turned a short pop melody into a 30+ minute improvisational vehicle at times