By Natalie Abrams
Updated February 17, 2017 at 08:08 PM EST
Jack Rowand/ABC

EW can exclusively reveal that the upcoming hour will feature seven songs, including a big solo for Jennifer Morrison’s Emma Swan.

Further details on the episode — including who else is singing, what they’re singing and why they’re singing — are still being kept under wraps. ( reported earlier Friday that Lana Parrilla would lend her voice to the episode.) When EW hit the set of Vancouver-based series last week, the cast was gleefully trying to sort some of that info out for themselves.

“We’ll all so excited about it,” Morrison tells EW. “It’s one of those things we’ve all thought about. Most of us have musical theater backgrounds or have had singing in our lives, or music in our lives, in some way. We’ve joked about it, thought about it. We’re all just listening to each other songs now trying to work out how the songs fit together and what the storyline is.”

The musical episode is slated to air this spring. Stay tuned for more details.

Once Upon a Time returns Sunday, March 5 at 8 p.m. ET on ABC.

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Once Upon a Time

Everything you’ve ever read about fairy tales is true—the residents of Storybrooke are living proof.

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