Grey's Anatomy ster Ellen Pompeo previewed the upcoming musical episode.

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artikel and video behind some of the actors who are singing in the musical episode

Meredith’s fertility treatments start affecting her eyesight; Mark talks to Callie and Arizona about his role as a father.

Watch Grey’s Anatomy Season 7 Episode 16 Megavideo

Meredith must choose between her fertility treatments and her eyesight when she begins having trouble seeing, Mark makes it clear to Callie and Arizona that he takes his role as father-to-be very seriously...