Underground Vol. 1: 1991–1994 is a collection of songs recorded when Three 6 Mafia first started their rap career. These songs have been taken from their underground mixtapes and albums such as DJ Paul & Juicy J's Vol. 1–3 mixtapes, DJ Paul & Lord Infamous' mixtapes, Juicy J's mixtapes and the Triple Six Mafia's Smoked Out, Loced Out tape.