Atlanta rap has evolved from boot-rattling regional scene to avant-garde pop sensation to the new sound of hip-hop America. Though its bass has been rumbling in cars and clubs since the late ’80s, it became one of hip-hop’s biggest creative forces in the ’90s and 2000s thanks to the lateral-minded boom of Outkast, the pop production of Jermaine Dupri, and the high-octane crunk of Lil Jon. Eventually spawning trap and new forms of vocal calligraphy, Atlanta became perhaps the most influential city on hip-hop’s map. Time and time again, the South has had something to say.