The music presented here marks a fundamental chapter in the evolution of Jesús "Chucho"'s career, leading him to become one of the best jazz pianists in the world. The concepts he implemented in the Cuban Jazz Quintet, the Modern Cuban Music Orchestra, and Irakere, find their roots in the group Chucho formed in the early 1960s, which, due to limited distribution, received little attention from jazz specialists and enthusiasts. Chucho's album Jazz Nocturno was recorded in the early 1960s. During the years he worked for the orchestra of Havana's musical theater, he formed his own group with his friend Carlos Emilio Morales on guitar, Paquito D'Rivera on saxophone and clarinet, Enrique "Kike" Hernandez on bass, Emilio del Monte on timbales, Julio Vento on flute, Alberto Valdés on trombone, and Oscar Valdés on congas. It is worth noting Chucho's exclusion of traditional drums, considering his intention to play jazz.