The_Low_End_Theory The Low End Theory is the second album by A Tribe Called Quest, released on September 24, 1991 through Jive Records. With the pairing of Q-Tip and Phife Dawg's lyrics, at turns socially charged, abstract and concretely grounded in reality, with groovy jazz samples, the album includes guests Brand Nubian, Diamond D and Leaders of the New School, the original rap group of Busta Rhymes.