J.Y. Park has penned zippy pop hits for some of K-pop's biggest groups ever, and saved a few high-energy numbers for himself. He's written synth-tinged retro numbers for Wonder Girls (“Nobody”) and melancholy piano ballads for boy group 2AM (“This Song”). And of course, he's gifted himself such songs as “Who's Your Mama?”, creating uptempo shufflers full of horn blurts and burbling basslines.