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OTRC: 'Grey's Anatomy: The Musical Event' airs on March 31 - see clips

Sara Ramirez appears in a still from 'Grey's Anatomy: The Muscial Event,' which aired on March 31, 2011. (ABC/Ron Tom)

"Grey's Anatomy: The Musical Event" airs on Thursday and ABC has unveiled some clips from the episode, which features much of the cast singing.

The episode is essentially extended musical fantasy played out in Callie Torres' (Sara Ramirez) head as the other doctors try to save her life following a tragic car crash. Check out the spoilers of what to expect and who will be singing in the musical episode below.

At the end of the last episode of "Grey's Anatomy," Dr. Arizona Robbins (Jessica Capshaw) proposed to Dr. Callie Torres (Ramirez) and they were hit head-on by a truck. Robbins was fine, but Torres, who was 6-months pregnant, went through the windshield. The musical episode picks up at this point, in Torres' outer-body experience and subconscious, which is framed in music.

The episode will include songs that should already be familiar to fans of the show, including The Fray's "How to Save a Life," Snow Patrol's "Chasing Cars" and Brandi Carlile's "The Story."

Also singing on the show will be several cast-members including Kevin McKidd, Eric Dane, Justin Chambers, Chandra Wilson, Ellen Pompeo and Chyler Leigh. Kate Walsh of "Private Practice" will return as a guest star, along with Rachael Taylor as Dr. Lucy Fields, Daniel Sunjata as Eli and Scott Foley as Henry. The guest stars are rumored to be singing in the musical numbers.

"Grey's Anatomy" creator Shona Rhimes is already itching to make another musical episode and talked to TV Line about what she would do differently and who surprised her.

"We discovered later than I would've liked that some people who claimed they couldn't sing could really sing," Rhimes told TV Line. "And I probably would've played that up more. Played with more voices... Justin Chambers really surprised me. He has an amazing voice. Chyler Leigh has an amazing voice. I think the only singing she had done prior to this was to her children. And Ellen Pompeo. Ellen's voice is really pure and true, and she was so sure that she couldn't sing and she really can."

And as for a future musical episode, Rhimes already has her heart set on some Rilo Kiley for Ellen Pompeo's musical number.

"I really want to see Ellen sing ["Portions For Foxes"] by Rilo Kiley, which was the very first song we ever had in the pilot," Rhimes said. "I've already been saying I want to do it again. It was really tough on everybody though. We've been working on the episode since September. Everything from rehearsals to recording, it was a really difficult episode. I don't know if we'll ever do it again, but I already want to."

Patrick "McDreamy" Dempsey was adamant about not singing, but talked to E! Online about his more vocally-inclined co-stars.

"I don't sing," Dempsey told E! "Sara Ramirez has got a great voice. Kevin McKidd's got a great voice. They're really carrying that episode, and I think they do a phenomenal job. Eric Dane is like Robert Goulet - really funny, really great voice. There are a lot of good, talented triple-threats on the show."

Correction: The headline of a previous version of the story said the episode would air on Friday. "Grey's Anatomy: The Music Event" will air on Thursday, March 31, at 9 p.m. ET on ABC..

Note on April 1, 2011: Clips from the show are not cleared for release beyond the show's original air date and have expired.

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