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Valence as a measure of happiness

In Spotify's API is something called Valence, that describes the musical positiveness conveyed by a track. Tracks with high valence sound more positive (happy, cheerful, euphoric), while tracks with low valence sound more negative (sad, depressed, angry).

But how can Spotify's API measure a "happy feeling" with numbers? can you give me some additional information about the algorithm involved? Thanks!

 

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