Pro Era, the New York City rap collective that includes Joey Bada$$, Kirk Knight, and CJ Fly, dropped their mixtape Peep The Aprocalypse in 2012. The tape's been re-released for Black Friday, and it sports a new song from the three aforementioned rappers called "Know The Rules." Produced by Statik Selectah, the song sports a sample of The Notorious B.I.G.'s "Long Kiss Goodnight" and tributes to Capital STEEZ, the Pro Era member who died days before the initial release of the tape. Listen to "Know The Rules" below.