Fig. 1: A geographic map of the song sampling according to the 10 principal musical-style regions of the world.
From: Musical scales optimize pitch spacing: a global analysis of traditional vocal music

This is color-coded by region. The 418 samples are distributed across the style-regions as follows: Africa, 41 songs; Australia, 17; Central Asia, 16; Circumpolar region, 52; East Asia, 50; Europe, 51; Insular Pacific, 52; Middle East-North Africa, 38; North America, 50; and South America, 51. The map was made in ArcGIS with further editing in Photopea.