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"The Song in Your Heart" is the 131st episode of Once Upon a Time.
In the fairytale land that was, Snow and Charming make a special wish that their child will be protected. The result? The entire kingdom starts bursting into song, much to the fury of the Evil Queen. Meanwhile, in Storybrooke, the Black Fairy announces her plans to unleash another curse on the town while Emma and Hook prepare for their wedding.
- The title card of this episode features an orchestra singing out, thus diminishing the usual musical accompaniment.
- Although credited, Emilie de Ravin (Belle French/Belle) is absent from this episode.
- The title of this episode was officially confirmed by executive producer/co-creator Adam Horowitz, via his Twitter account, on February 22, 2017.
- This episode marks the twenty-sixth overall writing credit for David H. Goodman, and the twenty-eighth for Andrew Chambliss.
Gallery of photographic stills released to promote the episode.