 Andy Bernard ( Ed Helms ) invites the latest roster of his Cornell University a cappella group , Here Comes Treble ( portrayed by the University of Virginia Hullabahoos ) , to perform for the office during the Halloween party . He secretly hopes the group will ask him to lead them in a performance of George Michael 's " Faith " . He becomes increasingly frustrated when the group is not interested in talking about his glory days as part of the group , and upon learning that old band mate Broccoli Rob ( Stephen Colbert ) claimed Andy 's nickname of " Boner Champ " , Andy complains to both Rob , via video chat , and to Erin Hannon ( Ellie Kemper ) . Though Erin sees the situation as trivial , she nonetheless demands that the group sing " Faith " for Andy . 
