The cast of Glee swung by It’s On with Alexa Chung on Tuesday, where they chatted about their latest album, their upcoming Madonna-themed episode, and got a surprise serenade by a devoted “Gleek.”

On Tuesday, producers of the FOX musical-comedy released Glee: The Music, Volume 1, the first album featuring music from the hit series. The second compilation disc, The Music, Volume 2, arrives Dec. 8.