Kate Walsh will return for Grey’s Anatomy: The Music Event – “Song Beneath the Song”

In a series first, the music that has been at the heart of the show and been beloved by fans will come to life for Grey’s Anatomy: The Music Event.

A cataclysmic event rattles the doctors of Seattle Grace to the core, as Callie, on the verge of an enormous life-changing moment with Arizona, envisions her hospital and friends as it has never-been-seen before. “Chasing Cars” (Snow Patrol), “How to Save a Life” (The Fray) and “The Story” (Brandi Carlile) are among the songs performed by the cast in one of the most special hours of “Greys Anatomy” yet.

A sneak peek track will be made available on iTunes Tuesday, March 29. The entire Grey’s Anatomy: The Music Event soundtrack – as performed by the cast – will be released Thursday, March 31. In celebration of the Music Event, abc.com will feature exclusive video content in the days leading up to the episode, including an ABC Music Lounge homepage takeover on Thursday, March 24.

“Grey’s Anatomy” stars Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sandra Oh as Cristina Yang, Justin Chambers as Alex Karev, Chandra Wilson as Miranda Bailey, James Pickens, Jr. as Richard Webber, Sara Ramirez as Callie Torres, Eric Dane as Mark Sloan, Chyler Leigh as Lexie Grey, Kevin McKidd as Owen Hunt, Jessica Capshaw as Arizona Robbins, Kim Raver as Teddy Altman, Jesse Williams as Jackson Avery and Sarah Drew as April Kepner.

Special guest star Kate Walsh as Addison. Also guest starring Rachael Taylor as Dr. Lucy Fields, Daniel Sunjata as Eli and Scott Foley as Henry. Co-starring Payton Silver as Dr. Knox.

“Song Beneath the Song” was written by Shonda Rhimes and directed by Tony Phelan. It will air on ABC on Thursday March 31st (9:00-10:01 p.m., ET).