Made up of Large Professor, K-Cut and Sir Scratch, Main Source changed the course of history with their 1991 debut Breaking Atoms. With intelligent lyrics that addressed complex subject matter set to mind-numbingly tight production, the album produced several hip-hop classics including "Looking At The Front Door" and "Just A Friendly Game Of Baseball." Perhaps most notably, however, was the high-energy posse cut "Live At The Barbeque," which introduced the world to a hungry young emcee by the name of Nasty Nas. Internal conflicts disbanded the original group, and Large Professor went on to produce hits for Pete Rock and CL Smooth, A Tribe Called Quest and others. An undeniable masterwork, Breaking Atoms is just as impressive now as ever.