This document of the Allmans’ storied 1971 Fillmore East run is the absolute apotheosis of the era’s jam-till-you-drop blues-rock style. The first half finds the band transforming vintage blues by the likes of Blind Willie McTell and Elmore James into fiery showcases for the twin-guitar attack of six-string superheroes Duane Allman and Dickey Betts. And the epic, churning original “Whipping Post” unforgettably captures both Gregg Allman’s gritty soulfulness and the entire band’s telepathic interaction. It’s really one of rock’s finest live albums.