The Insider.com

Who knew Bruno Mars was such a serious The Little Mermaid fan?

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Bruno Mars sang both Part of Your World and Under the Sea from the Disney classic during his 20-minute set for the BBC Live Lounge, where he joked about the importance of the memorable tune.

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"There's this one song, this cover that we used to do, that I could never get through because I choke up. It's the best song ever written. [But] I want to look fear in the eyes right now, and then I want to kick it in the ding ding," he said before launching into a great version of Part of Your World.

Though the Disney tunes weren't the only part of his set that was a surprise -- he also sang an a cappella version of Silent Night and paid homage to Jimi Hendrix with a cover of Fire.

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Check out the video for the silly on-stage moment.