Credit: Beth Dubber/FOX ©2012 Fox Broadcasting Co.

Glee Season 5, Episode 4: “A Katy or a Gaga” is all about the music of Katy Perry and Lady Gaga... with a little bit of Demi Lovato! In one of the show’s most inspired casting choice in recent history, the megawatt pop star has a recurring role on Glee Season 5 as Dani, a new love interest for Santana (Naya Rivera).

She might have been absent in Episode 3, but Demi is back this week... and she’s taking the lead for the Glee cast’s version of Katy Perry’s “Roar.” This tune will be a split performance: taking place half in New York City and half at McKinley High School in Ohio.

We’ve already seen spoiler photos from McKinley High School’s side of the performance, and they’re pretty fantastic. The auditorium has been transformed into a lush green jungle. Oh, and pretty much all the guys are shirtless. We like that a lot, too.

Over in NYC, Dani and fellow celebrity guest star Adam Lambert will lend their vocals to the song. It’s part of band practice for Kurt’s new group, and we’ve already seen a couple of on-set spoiler photos from when filming was happening back in late September.Take a listen to the finished track, then sound off below and let us know what you think!