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 addresses the "generic complex system": "In his works Música Folklórica Cubana and Del canto y el tiempo, he (León) presents a comprehensive examination of our music centered around the portrayal of Cuba's fundamental musical styles."