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Guess the Episode [Medium]
(sh.itjust.works)
That's "Lisa" performing the "I Want Candy" song as part of "The Simpson Family Smile-Time Variety Hour", which itself was part three of "The Simpsons Spin-Off Showcase" episode.
And the name of the dance is the Peppermint Twist! (Correct!)
Look, Big Daddy, it's regular Daddy.
Everything related to The Simpsons!