By Eliot Van Buskirk from Spotify Insights. Music’s emotional power stems from a mix of factors, only some of which we understand. Much about music resists full explanation. One thing we do know: Some of the magic has to do with dynamics: changes from soft to loud, or from loud to soft. The most dramatic part of a song often coincides with a crescendo (when the music gets louder). That’s when everything kicks in, louder effects and guitar pedals come into play, and the engineer pushes the sliders up to 11. Just ask the Pixies, whose quiet verses and loud...

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