I feel like Chicagoans find out about a lot of music before anyone else. Wiz was popular in Chicago at the beginning of last year and the hype is all about him right now. The next big thing in the rap world is definitely going to be OFWGKTA. They're like a rap group from CA of like 16-19 year olds who started out as skateboarders. They originally gained attention through this one video called EARL Sweatshirt. Its a pretty grimy nasty video but worth checking out nonetheless.