The episode will focus on some kind of crisis for Callie (Sara Ramirez) as she imagines the hospital and her friends in unexpected (and obviously musical) ways. It sounds outside the box for the show, but we know the cast has an amazing amount of talented singers on it and "Private Practice's" Kate Walsh (Addison) returns for the episode.
Plus, creator Shonda Rhimes wrote the script herself! "This is not jumping the shark, it's not a trick, it's not a gimmick," Jesse Williams, who plays Jackson, tells Zap2it. "It's totally in line with this season and these characters. And it's just incredibly moving."
Also, ABC just announced that iTunes will have a sneak peek at the musical event's soundtrack on Tuesday, March 29.
The full "Grey's Anatomy: The Music Event" soundtrack featuring the cast, including songs by Ramirez, a Tony Award winner for Broadway's "Spamalot," Kevin McKidd (Owen), Chandra Wilson (Bailey), and Chyler Leigh (Lexie) will be available on Thursday, March 31 - the same day the episode airs on ABC.
Don't forget to keep an eye on ABC's Music Lounge in the days approaching the episode as the network promises exclusive video from the music event.
Source (view sneaks at the source link)