The always-prolific Diplo has been especially visible lately -- a new book coming out and an Usher collab will do that for you -- and tomorrow he'll drop "Express Yourself," a frenetic club track starring Jamaican dancehall singer Nicky Da B. Download "Express Yourself" and check out Diplo's great new medium-burner with Usher, "Climax," below. Diplo - "Express Yourself (Feat. ...