Premise: José Venegas, known as "El Bronco", was a Mexican singer and film actor best known as Epigmenio Zúñiga in the film "La Valentina". Originally from San Buenaventura, Chihuahua, Venegas was born José Montaño. After having migrated to Mexico City, in order to pursue his talent, Venegas appeared in five films in which he also sang until an alleged confrontation with Pedro Infante stooped his career.
Hypothesis: Venegas sang in Spanish in his films.