His participation at a folkloric amateur competition sponsored by Roque Centurión Miranda at the Municipal Theatre was the event that convinced the most to become a professional musician.
In that occasion won the first prize representing Villarica and performing "Che la reina" by Emiliano R. Fernández and Félix Pérez Cardozo.
In 1931, he traveled to Montevideo, Uruguay, and afterward moved to Buenos Aires, where he joined Mauricio Cardozo Ocampo in the famous duo "Martínez-Cardozo".
Back to Buenos Aires had at his charge, the music for the film "El trueno entre las hojas", ("The thunder among the leaves") directed by Armando Bo with script from Augusto Roa Bastos.
To his composer and singer skills, he added his natural gift for speech, his implacable scold to the ones who negated the great truths of the Paraguayan music related to the "golden generation" that he used to know as few, and his amazing charisma.