John Lennon and Paul McCartney wrote this as a showcase song for George Harrison, who sang lead. George had already written only one Beatles song by this point: "Don't Bother Me."
Typical of the early Beatles, this is a very innocent song - the singer is taking it slow, as he's OK just dancing with the girl of his dreams. There is an old-time Irving Berlin/Cole Porter feel to the song, focusing on the de-lightful feeling of being smitten.
The Beatles performed this in their movie A Hard Day's Night, giving Harrison some quality screen time.
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