<Table> <Tr> <Td> Glee: The Music, Volume 5 (2011) Glee: The Music, Volume 5 2011 </Td> <Td> Glee: The Music Presents the Warblers (2011) </Td> <Td> Glee: The Music, Volume 6 (2011) Glee: The Music, Volume 6 2011 </Td> </Tr> </Table> <Tr> <Td> Glee: The Music, Volume 5 (2011) Glee: The Music, Volume 5 2011 </Td> <Td> Glee: The Music Presents the Warblers (2011) </Td> <Td> Glee: The Music, Volume 6 (2011) Glee: The Music, Volume 6 2011 </Td> </Tr> <P> Glee: The Music Presents the Warblers is the seventh soundtrack album by the cast of Glee, a musical comedy - drama television series that airs on Fox in the United States . Released through Columbia Records on April 19, 2011, it contains thirteen covers: eleven accompanying performances from the series' second season and two exclusive to the album . Performers are portrayed on Glee as the fictional Dalton Academy Warblers, an all - male high school glee club from Westerville, Ohio . Darren Criss serves as lead vocalist, with Chris Colfer singing lead on one track and co-lead on a couple of others, while the Beelzebubs, an all - male a cappella group from Tufts University, provide background vocals . Dante Di Loreto and Brad Falchuk serve as the album's executive producers, and its tracks have collectively sold over 1.3 million copies . </P> <P> The Dalton Academy Warblers, an a cappella glee club from a fictional private school in Westerville, Ohio, were first introduced in the episode "Never Been Kissed". The episode also introduced recurring guest star Darren Criss as Blaine Anderson, lead singer and junior member of the group . Performing a cover version of Katy Perry's "Teenage Dream", actors for the Warblers lip synced to background vocals provided by the Beelzebubs, an all - male a cappella group from Tufts University in Somerville, Massachusetts . According to the Beelzebubs' president Eli Seidman, the producers of Glee were considering having the singers appear on the series, but the idea of having students flown across the continent to Los Angeles, California proved too logistically unrealistic . Kurt Hummel, portrayed by series regular Chris Colfer, enrolls in Dalton Academy in the episode "Special Education" and joins the Warblers in performances, starting as a background singer with Train's "Hey, Soul Sister". Kurt later duets with Blaine on Neon Trees' "Animal" and Hey Monday's "Candles". Song arrangements were done by Beelzebubs alumnus Ed Boyer, and vocals for all songs were recorded at Q Division Studios in Somerville, with the exception of "Teenage Dream", which was done in New York City . </P>

When did the warblers first appear on glee