Music genres are hard to be systematically described and no complete agreement exists in their definition and as- sessment.Under this per- spective, the community plays the role of establishing an ontology of inner phenomena (properties and rules that make a genre) and external differences (habits that em- body distinguishing behavior and trends)."Genres emerge as terms, nouns that define re- currences and similarities that members of a community make pertinent to identify musical events" [11], [5].