1. There’s an unforgettable hook in each of those pop songs.
2. I can’t get the hooks of those songs out of my mind! All I can think about is “sorry, sorry, gee gee gee baby baby oh, wuppa Gangnam style.”
Article about Korean pop songs and their use of hooks: http://www.rollingstone.com/music/lists/the-10-k-pop-groups-most-likely-to-break-in-america-20120518