Roots of Agitation Free

The Grateful Dead was an American rock band formed in Palo Alto, California, in 1965. Known for their eclectic style that fused elements of rock, blues, jazz, folk, country, bluegrass, rock and roll, gospel, reggae, and world music with psychedelia, the band is famous for improvisation during their live performances, and for their devoted fan base, known as "Deadheads". According to the musician and writer Lenny Kaye, the music of the Grateful Dead "touches on ground that most other groups don't even know exists". For the range of their influences and the structure of their live performances, the Grateful Dead are considered "the pioneering godfathers of the jam band world".

The Allman Brothers Band was an American rock band formed in Jacksonville, Florida, in 1969. Brothers Duane and Gregg Allman founded it with Dickey Betts, Berry Oakley (bass), Butch Trucks (drums), and Jai Johanny "Jaimoe" Johanson (drums). Subsequently based in Macon, Georgia, they incorporated elements of blues, jazz and country music and their live shows featured jam band-style improvisation and instrumentals.