Humans everywhere seem wired to favour simple integer-ratio rhythms, but culture tweaks which rhythms become “natural.” This suggests a shared rhythm cognition backbone, yet enough flexibility to account for global musical diversity. The study is a solid counter to the claim that music structure is purely learned or arbitrary, while also showing culture doesn’t just ride on biology: it shapes what we actually use.<p>If you’re into music cognition, evolution of culture, or cognitive universals vs cultural diversity, this is the kind of data you want to see.