Heraclio Fernández Noya (1851–1886), was a Venezuelan musician, best known for the composition El Diablo Suelto.

composer of the moment; as well as satirical-humorous musical literary works, which Fernández signed with the pseudonym "El Zancudo".

In the magazine El Museo, on San José's day in 1888, "El diablo suelto" was released, a joropeado waltz composed by Heraclio Fernández, whose score was located and published by "the world's first guitarist", Alirio Díaz and later by José Peñín, editor and director of the Spanish and Hispano-American Music Dictionary and the Encyclopedia of Music in Venezuela.

About Heraclio Fernandez and his ability as a pianist was read in the newspaper El Zancudo: "He played the piano with exquisite feeling and composed pieces of living room that lovers of good music kept as a model of rhythms and forms."

Pieces such as "Misa a dos voces", the waltzes "Echoes of the heart", "The variations on the araguato", "Happy New Year", "To General Francisco Alcántara" and the dances "La juguetona", "Violetas sensivas", "Do not forget me" and "Recuerdos del teatro Naar" are part of the richest Venezuelan music collection, which nowadays travels the world, in particular, in the notes of "El diablo suelto" by Heraclio Fernández.