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Is there a secret formula to unforgettable musical hits? A deep dive into 2,000 of theatre's biggest songs

A great musical number does more than hit the right notes, it stays with you long after the curtain falls. But what exactly makes a musical song unforgettable?

Using Spotify ’s extensive library of audio features, the study identified ten key musical characteristics - including tempo, energy levels and emotional tone - that define the most successful show tunes. Among the standout findings was a balance between danceability—defined by factors such as tempo, rhythm stability, and beat strength—emotional depth, and orchestral richness, with minimal spoken-word elements to maintain a song’s melodic flow. The study also found that the most-streamed musical numbers share common traits: they deliver powerful emotional highs and lows, mark pivotal narrative moments and feature catchy melodies that encourage repeated listening.

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