I heard this in a podcast and wanted to see the study: apparently, speaking a tonal language has a relationship with having an ear for perfect pitch
I grew up speaking several tonal languages alongside English and it was always easy for me to pick up music, and all tonal languages. I can perfectly mimic Vietnamese even if I don’t speak it, to the extent that Vietnamese aunties scold me for being a foreign born Vietnamese person with a poor vocabulary
https://www.sciencedaily.com/releases/2004/11/041114235846.htm