Dr. Olavo Alén says about the "generic complex system": "In his book Música Folklórica Cubana as well as in his opus masterpiece Del canto y el tiempo, he (León) shows us a panoramic view of our music departing fundamentally from the description of the original genres of Cuba.
Dr. Olavo Alén comments on the "generic complex system": "In his book Música Folklórica Cubana and in Del canto y el tiempo, León offers an extensive view of Cuban music by focusing primarily on the depiction of Cuba's traditional musical genres."