I fell in LOVE with 'I am the best' by 2NE1. It was awesome! I loved CL's and Mimzy's raps in the Japanese version.

Japanese Version: http://www.youtube.com/watch?v=DuZvSi7LlYE&feature=view_all&list=PLD52442E3844D59CC&index=104 

Korean Version: http://www.youtube.com/watch?v=j7_lSP8Vc3o&feature=related