Im hoping to rap, Parrilla told EW ahead of filming the musical episode.

Thats just the Brooklyn girl in me that wants to rap.

I just pitched that idea.

LANA PARRIL

Credit: Jack Rowand/ABC

I havent gotten a response.

I am hoping to rap, but its highly unlikely.

While Parrilla was game to lend her voice to the hour, she admits there was some hesitation.

I trained my voice for many years for acting.

Its a very different kind of thing.

Its been 20 years, but its been fun.

As for why the denizens of Storybrooke will be breaking into song, Parrilla teases, Something happens.

I dont think I can really talk about it, but lets just say its not a choice.

It kind of comes upon them.

Once Upon a Timeairs Sundays at 8 p.m.