During the 1960s, a methodological organization was consistently applied to the Cuban popular music; and that methodology, called of the "generic complexes" was mainly based on the works of Cuban musicologist Argeliers León. In his book Del canto y el tiempo, León divided the study of Cuban popular music in several sections presented in the following order: "Música yoruba", "Música bantú", "Música abakuá", "Música guajira", "El son", "La rumba", "La guaracha", "La canción y el bolero", "Música instrumental", "De la contradanza al danzón, al chachachá" and "Hacia el presente, en el presente".