'Grey's Anatomy' creator Shonda Rhimes has revealed that there will be a musical episode of the show in the current seventh season.
In an exclusive interview with TVGuide.com, Rhimes was asked for the reasoning behind the episode.
She replied: "We keep saying that season six and seven are seasons to try anything and everything that we've always wanted to do.
"I've wanted to do a musical episode since the first day we started shooting season one.
"Now, we're in that place that we have the space to try it. Also, it's a period of time in which I finally have the right idea and the right talent to make that happen."
Rhimes cited the musical episode of 'Buffy the Vampire Slayer' as one of her personal favourites.
"[Ours] is sort of the opposite of that in a weird way," she said.
"They did an all-out, show-stopping, Broadway kind of musical. This is very different."
Rhimes said that the episode would be a "Callie-heavy story".
Actress Sara Ramirez, who plays Callie, won a Tony Award for her work in the Broadway musical 'Spamalot'.
Rhimes said of the episode's plot: "The storyline is in very early stages. We're not going to have an episode where you turn on the television and people are singing for no reason. It has a reason, there's a story underneath it and there's a point to the whole thing.
"I'm still nervous about it, because you can do something like this and it can come out not the way you intended. I have been working on this very carefully because I want it to still be our show, but also heighten it."
She added: "Nobody is going to be dancing and singing down the halls; that's not our show. Our show is known for its music. I very much wanted to do something that was musical without being a musical."
