The Allman Brothers' 1971 album At Fillmore East features one of the era's great rock bands at its prime, selling over a million copies despite not producing a single "hit" song. It is also the last album produced by the Allman Brothers prior to the death of the band's founder, Duane Allman. In this episode we speak with Bob Beatty, whose new book Play All Night!: Duane Allman and the Journey to Fillmore East, tells the story behind the creation of the album and how the Allman Brothers pioneered a style that continues to influence rock music today.

Dr. Bob Beatty is a historian and musician who has worked in museums and nonprofits for more than 25 years. You can follow him on twitter and Instagram at @longlivetheabb.

This episode was edited by Ben Sawyer.