Ever since the boys of MBLAQ debuted last year, they have come quite a long way in their music career, especially with their two hit tracks Oh Yeah and Y. Although they had quite a success ever since their debut, they weren't able to win any awards in music programs until last week, when they snatched the first place on Mnet's M! Countdown. On today's episode of Music Bank, the boys were back on stage to perform Y. Check out their terrific performance below! http://www.youtube.com/watch?v=OmAG715JFUY