WATCH: Sara Ramirez Belts Out Song from 'Grey's Anatomy' Musical Episode

The Tony-winning actress' costars are raving about her performance in Thursday's song-filled, emotionally powerful episode

Sara Ramirez will be flexing her musical-theater muscles on Thursday's big musical episode of Grey's Anatomy. The Tony winner, who plays doctor Callie Torres on the show, previewed one of the episode's tunes on Wednesday's Good Morning America. Watch her live rendition of Brandi Carlile's ballad "The Story" in the clip below!

Ramirez, 35, was actually invited to join Grey's Anatomy after network execs saw her acclaimed performance in Broadway's Spamalot. Naturally, series creator Shonda Rimes put Ramirez front and center in the "musical event," creating it as a hallucination in Callie's mind.

Even knowing about Ramirez's singing skills, her fellow cast members tell People that she blew them away. "She's pretty amazing! I mean, off the chart," says costar Kevin McKidd. "She's a Tony Award winner for a reason, and the rest of us bask in her shadow."

Patrick Dempsey, who opted out of singing ("I have no voice at all"), says that the rest of the cast really rose to the challenge, too. "Everybody was a little leery of it at first, because we were like, 'Well, should we jump on the bandwagon of Glee?" admits Dempsey. "But it was an opportunity, I think, for some of the cast members to really show their talents musically. And it's really quite moving when you hear Sara's voice and Kevin's voice. Even Justin Chambers sings beautifully, and Eric Dane does a great job."

Ramirez says that she was "really inspired" by the cast's willingness to sing on camera. For her, the most surprising musical talent was costar Chyler Leigh.

"She sings a beautiful song called 'Breathe,' and she does an amazing job," Ramirez told GMA. "She has never really sung before in public... She's so shy about it. Maybe this will be a new avenue for her. I just love her."

Indeed, Ramirez's self-titled EP hit iTunes this week, boasting four tracks: A cover of "The Story," plus three original songs titled "Break My Heart," "Waitin" and "Eye to Eye." Sounds like Glee may have some new competition on the charts!

Grey's Anatomy: The Musical Event airs Thursday night at 9 p.m. ET on ABC.

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