The fourth volume of the now legendary Hip Hop Family Tree saga has arrived!  Hip Hop enters a new era with this volume as Salt-N-Pepa make the scene as does the rapper's rapper, Rakim.  Also, the era-defining  Def Jam records is launched and hip hop's center of gravity shifts westward as we are introduced to Dr. Dre and Will Smith and Hollywood finally gets wind of it and starts to cash in with films like Breakin’, Breakin’ 2 Electric Boogaloo, Beat Street, and Krush Groove.