 Midway through the party , Dwight enters the conference room and sets up his own speaker system to play Christmas Eve / Sarajevo 12 / 24 , a heavy metal medley of traditional Christmas songs performed by Savatage and the Trans @-@ Siberian Orchestra . The song acts as a backdrop to a brief montage of various scenes of members of the office exchanging gifts while shots of Dwight , Nate , Creed , and Gabe air @-@ guitaring along are interspersed . 
