Earlier we reported that Brian Joo would be having a special guest performer on today's episode of Music Bank. Last evening, we got to watch the two together on Mnet M! Countdown. Now we've got a second take�as American R&B singer Jason Derulo joins Brian to perform their track In My Head on Music Bank! In My Head is originally Derulo's track, but the American artist allowed Brian to make an official Korean cover release. Now the two make a joint duet performance on stage, and we even get to listen to Brian's English. http://www.youtube.com/watch?v=YE8Hun6psYc