Remember 3OH!3? They were the jokey electro-pop playboys before LMFAO with the hits "Don't Trust Me" and "My First Kiss." Well, the Colorado duo is taking its pop slightly more serious on "You're Gonna Love This" (Photo Finish), which takes an edgier route to dance-floor domination, throwing in dubstep breakdowns and a more aggressive beat in with the fun. Is there room enough for two party-rocking duos at the top? We'll find out. "This" is a pretty good challenge.