By analyzing song and speech samples from 75 people representing various cultures around the world, they discovered that traditional songs generally tend to be slower and higher-pitched and to have more stable pitches overall than spoken language.
These rules still have exceptions, they reveal hidden commonalities that could hint at how what we think of as music evolved in the first place.
We can find something we can call music in every society, says the study's lead author Yuto Ozaki, who studies cross-cultural diversity in music at Keio University in Tokyo.
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