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Sources:

The Sound of Intelligence (2016)

https://www.academia.edu/65273841/The_Sound_of_Intelligence

Intelligence, music preferences, and uses of music from the perspective of evolutionary psychology (2019)

https://psycnet.apa.org/doiLanding?doi=10.1037%2Febs0000124

As tested in Romania.

With no indication of how the subjects were selected.

Social class and musical education are obvious confounding variables, while they only looked at age and gender.

They cite Virgil Griffith, which https://brainvolts.northwestern.edu/wp-content/uploads/boxtr... categorizes as "noted Internet data miner Virgil Griffith". There's a Wikipedia page about him at https://en.wikipedia.org/wiki/Virgil_Griffith . Looks like he got out of prison last year.

Google Scholar knows of no citations to the paper, nor favorable reviews for Griffith's analysis other than what appears to me to be a couple of kooks.

The paper comes across to me, a non-expert, as low quality.