Which college a cappella group does Andy invite to perform during season 9 of "The Office"?

Andy invites the college a cappella group Here Comes Treble to perform during season 9 of The Office. The group appears in the season-nine episode “Here Comes Treble,” when Andy brings his former Cornell University singing group to Dunder Mifflin’s Halloween party.

The visit is meant to showcase Andy’s college identity and his lingering pride in Cornell. Here Comes Treble performs without instrumental accompaniment, including a version of “Karma Chameleon,” but the event turns awkward when Andy’s former rival Broccoli Rob becomes involved. Stephen Colbert plays Broccoli Rob, a former member whose presence exposes Andy’s jealousy and unresolved feelings about his college years.

The fictional group is a parody of collegiate a cappella culture, and the episode was filmed with members of the University of Virginia group Hullabahoos portraying the singers. That real-world connection can cause confusion: Hullabahoos is the performing group seen on screen, but Here Comes Treble is the fictional group’s name within the show. The episode aired as season 9, episode 5, in 2012.