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Here's a sneak look at Neil Patrick Harris talking about next week's episode of GLEE, 'Dream On', which airs Tuesday night, May 18th! In this clip Harris talks about his character's history with Will and GLEE club, what songs he'll be performing, working again with Joss Whedon, 'sexual tension' with Sue Sylvester and more...

Here's a sneak look at Matthew Morrison talking about next week's episode of GLEE, 'Dream On', which airs Tuesday night, May 18th! In this clip Morrison talks about working with Neil Patrick Harris, singing 'Dream On', on the friendly rivalry between stars and more...

A full audio clip has been released of Lea Michele and Idina Menzel singing 'I Dreamed a Dream' from Les Miserables on GLEE!

A full clip has been released for GLEE's highly anticipated Lady Gaga episode and it features the cast singing the hit song - BAD ROMANCE!

A full clip has been released for GLEE's highly anticipated Lady Gaga episode and it features the cast singing the KISS song - BETH!

A full clip has been released for GLEE's highly anticipated Lady Gaga episode and it features Idina Menzel and Lea Michele singing Lady Gaga's hit song - Poker Face!

A second preview clip has been released for GLEE's highly anticipated Lady Gaga episode and it features 'Bad Romance'. Miss the first clip, click here.

A second preview clip has been released for GLEE's highly anticipated Lady Gaga episode and it features Idina Menzel and Lea Michele singing Lady Gaga's hit song - Poker Face! Miss the first clip from the duet? Click here.

Last month, the producers of GLEE launched a nationwide MySpace casting call. With 28,000 auditions, 18 million video views and 85 million gold stars already given to the hopefuls, the response to the GLEE open casting call on MySpace was so overwhelming that the submission window was extended, ending on Thursday, April 29 at 11:59 AM PST.

Preview clips have been released for GLEE's highly anticipated Lady Gaga episode including Loser, Give Up The Funk, Beth, Pokerface & more!

A preview clip has been released of Lea Michele (heard in this clip) and Idina Menzel singing 'I Dreamed a Dream' from Les Miserables on GLEE!

Watch Season 1, Episode 18 of GLEE titled 'Laryngitis' which aired on Tuesday, May 11.

The second preview clip has been released for GLEE's highly anticipated Lady Gaga episode and it features Idina Menzel and Lea Michele singing Lady Gaga's hit song - Poker Face!

Here's a sneak look at next week's episode of GLEE, 'Dream On', which airs Tuesday night, May 18th! In an episode directed by Emmy Award winner Joss Whedon, Mr. Schuester's former high school nemesis (Neil Patrick Harris) causes trouble for the glee club. Rachel struggles with a life-long personal issue, and Artie's dreams take him on an adventure. Additional guest stars include Molly Shannon, Idina Menzel and Jonathan Groff.

Here's the complete 'One' from Season 1, Episode 18 of GLEE titled 'Laryngitis' which airs on Tuesday, May 11.

Puck and Mercedes sing 'Lady is a Tramp' from Season 1, Episode 18 of GLEE titled 'Laryngitis' which airs on Tuesday, May 11.

Here's the complete 'The Boy Is Mine' from Season 1, Episode 18 of GLEE titled 'Laryngitis' which airs on Tuesday, May 11.

Finn takes lead in 'Jesse's Girl' from Season 1, Episode 18 of GLEE titled 'Laryngitis' which airs on Tuesday, May 11.

Kurt (Chris Colfer) takes the lead in 'Rose's Turn' in Season 1, Episode 18 of GLEE titled 'Laryngitis' which airs on Tuesday, May 11.

The first preview clip has been released for GLEE's highly anticipated Lady Gaga episode and it features 'Bad Romance'.