Fig. 7: A typology of world scales in the corpus of 418 songs (manual scale annotation).
From: Musical scales optimize pitch spacing: a global analysis of traditional vocal music
This is based on a classification of the scale sequence in the central pentachord (i.e., C to G) of the transposed unwrapped scales. A plurality of the scales (40.9%) were not part of the major/minor typology. Of these, 27.9% of the overall scales were “undefined,” since they were not of an established scale-type in the comparative musicology literature.
