4 chords

I V vi IV

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Chopin Preludes:
e minor - https://www.youtube.com/watch?v=ef-4Bv5Ng0w
c minor - https://www.youtube.com/watch?v=7zQYuhR-TUQ

Sources:

https://www.nature.com/articles/nn.2726.epdf?referrer_access_token=n2Sw7NoWhdSpm_ZSP9Mc79RgN0jAjWel9jnR3ZoTv0PZhF0xUDVMe20KAJehTFUp9hVRHBDZ09f_R6NPRtQ5bjc3sv4Gd9024OodEAOqgX1_hE0q2vWmvyPSbtK8COCXYmH8PPf2zoBbqqt6xUoOnC0Z2eIqwfnRmUxwFzT3AwROJixNjJaWQ1iE6oTdeKLYrrSOL0oCq8cAVuvnaiqdlObc02OKgJNScafbsGnaZ5w%3D&tracking_referrer=mentalfloss.com

http://www.pnas.org/content/98/20/11818.long

https://www.mitpressjournals.org/doi/pdf/10.1162/jocn_a_00371

Видео 4 chords канала Sideways