Ignacio Soto published the article "A Genre Classification Scheme for Metal-Music Corpus Studies: An Eleven-Bucket and Seventeen-Category Encoding of Encyclopaedia Metallum Genre Strings" in the journal Data. The CMUS principal researcher notes that this is a type of article in which a dataset is presented so that it can be used in other research studies.

The abstract reads as follows: This data descriptor documents a two-level genre classification scheme for metal-music corpus studies derived from Encyclopaedia Metallum’s multi-label genre strings. The scheme assigns each band to one of eleven mutually exclusive primary buckets and, alternatively, to one of seventeen finer-grained sub-categories that separate closely related sub-styles. Classification is implemented by keyword priority on the lower-cased genre string and is fully deterministic given the published keyword table. The scheme was developed and tested on a corpus of 560 metal bands from Southern Chile (1988–2024), which serves as the development corpus throughout.

You can access the article at this link.