At the dawn of the hip-hop era, all rap was East Coast rap. All of rap's most important early artists were based in the New York City area -- old-school legends like DJ Kool Herc, Grandmaster Flash, Afrika Bambaataa, the Sugarhill Gang, Kurtis Blow, and Run-D.M.C. As rap grew and became more diverse over the course of the '80s, productive scenes began to spring up in other locations around the country; nonetheless, East Coast rap dominated through most of the '80s. Although the sound of East Coast rap wasn't completely uniform, from the mid- to late '80s it tended to gravitate to more aggressive beats and sample collages, and many MCs prided themselves on their technical dexterity in crafting lyrics.