Moon River" by Melissa Benoist (Kara Danvers) - The Flash & Supergirl Musical Crossover - YouTube
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VIDEO: Melissa Benoist Sings 'Moon River' on 'Supergirl/Flash' Crossover! | Flash, Grant Gustin, Melissa Benoist, SuperGirl, Television, Video | Just Jared Jr.
Melissa Benoist Sings About What To Expect In Supergirl/Flash Musical Crossover | PEN | People - YouTube