Some more info from EW:
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. (TVLine.com 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.
Read more here: http://ew.com/tv/2017/02/17/once-upon-time-musical-episode-spoilers/
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