The Allman Brothers Band “Mountain Jam” 33:41
This live improvisation based on the melody from folkie Donovan’s song “There Is A Mountain” originally took up two full LP sides on the original Eat a Peach double album. The digital era united the two halves for one, blissed out, exploratory, Southern rock hoedown, clocking it at over 33 minutes. And it kicks ass.
Jethro Tull “Thick as a Brick” Time: 43:50
Though the 1973 follow-up album A Passion Play is technically longer, this 1972 single-song release is more well-known and was better-received. The album’s artwork claimed its contents to be a musical adaptation of a poem by a fictional 8-year-old boy, but the lyrics were actually penned by flute-flailing frontman Ian Anderson.