New Directions' rivals, the Dalton Academy Warblers, debuted with a bang in the second season of Glee; their version of Katy Perry's “Teenage Dream” became the fastest-selling single in the history of the show! This beloved male a cappella group starring Darren Criss and Chris Colfer now has its own release, Glee: The Music Presents the Warblers. This collection features their versions of 13 hit tunes.