'Glee' songs: Listen to Adam Lambert's debut in 'A Katy or a Gaga'

glee-adam-lambert-a-katy-or-a-gaga.jpg "Glee" is having a diva-off in "A Katy or a Gaga," the first episode following the show's touching tribute to Cory Monteith. In this week's assignment Mr. Schuester ( Matthew Morrison) tasks the glee club with figuring out their true personality type: are they a Katy Perry or a Lady Gaga?

Meanwhile, in New York, Kurt ( Chris Colfer) has his first encounter with the extremely charismatic Starchild ( Adam Lambert), who auditions for his new band. Demi Lovato also guest stars as Santana's ( Naya Rivera) new lady love.

Check out the songs below. How do you think they'll fit in the episode?

"Applause," Lady Gaga



"Roar," Katy Perry



"Marry the Night," Lady Gaga



"Wide Awake," Katy Perry



"Glee" airs Thursdays at 9 p.m. ET/PT on FOX.
Photo/Video credit: FOX