Unless you're an obsessive chronicler of hip-hop microtrends, Yung Gleesh's output, which lays mush-mouthed rhymes over woozy, molasses-slow beats, will most likely scan as an oddity at best. But the D.C. MC has a growing Internet following and a collaborator list that includes everyone from Chicago drill poster boy Chief Keef to Swedish cloud-rap phenom Yung Lean. Gleesh is one to watch.