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This is a cool analysis featuring an interesting metric (degree of compressibility) for measuring repetitiveness in song lyrics. Great graphics explaining the algorithm too!

Spoiler: Lyrics do seem to get more repetitive.

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Degree of compressibility is an interesting tool that serves many purposes. One that I like is Normalized compression Distance (https://en.wikipedia.org/wiki/Normalized_compression_distanc... is a light starting point).

With NCD you can measure, for example, how similar two lyrics are, or even group similar songs together.

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