After hip-hop became recognized, it matured, and a lot more groups starting making hip-hop. . By 1989 Public Enemy was working with The Bomb Squad, N.W.A. released “straight outta compton”, and the beastie boys had released one of their most popular albums, Paul’s Boutique. Which sold well over 2 million copies by 1999
In the 1990’s, a whole different type of sound came out, with groups such as The Wu-Tang-Clan, Dr. Dre's The Chronic,