There is no specific element that makes a song catchy. If there was, musicians would use it all the time! What Disney does have is a budget big enough to hire the best songwriters and performers for their songs, which undergo much editing and revising before they make it to you. So if there are any elements which make it into a successful song they are hard work, knowledge of musical craftsmanship, and (above all, I think) a great performance. *Let It Go* is an instant earworm when Idina Menzel sings it, not so much when it’s an off-key five year old.
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