Ryan Gosling played Ken in the summer's top-grossing movie.

He wanted Ken's character to have depth beyond being arm candy.

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Behind-the-scenes footage reveals Gosling's talents in the power ballad, "I'm Just Ken."

Fans of Greta Gerwig's blockbuster can watch the cast rehearse for the musical number.

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The video includes moments of Gerwig laughing at the performance.

"I'm Just Ken" debuted on the Billboard Hot 100 and other music charts.

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The song received over 5 million streams in its first week.

"Barbie" is poised to be the top-grossing film of 2023.