Singer, Composer Gilberto Alejandro Durán Diaz, known to all as Alejo Durán or "El Negro Grande" (the great black Man) (February 9, 1919 – November 15, 1989) was a Colombian vallenato music traditional composer, singer and accordionist.

[1] Duran was born in El Paso, Cesar and for most of his life he worked as a cowboy.

Colombian musician Carlos Vives did cover versions of his songs.

Popular songs he wrote include "Altos del Rosario", "Pedazo de Acordeón," "Fidelina," and "La Cachucha Bacana".

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