In Buenos Aires, he worked with other singers such as Samuel Aguayo, Emilio Bobadilla Cáceres and Diosnel Chase.

In 1944, he continued his studies in the Music School of Rio de Janeiro University, thanks to a scholarship granted by the government.

In 1947, he traveled from Brazil to Mexico, where he was invited by Gumersindo Ayala Aquino to join the group “Los Guaireños”, with Luis Alberto del Paraná, Digno Garcia and Humberto Barua.

In 1954, Luis Alberto del Paraná asked him to join the “Trio Los Paraguayos”, with the harpist Digno Garcia.

In 1957 he organized his own group “Barboza y sus compañeros”, with Ramón Mendoza, Leonardo Figueroa and Carlos Centurion, continuing to spread his work through Europe and the Middle East.

They recorded three long plays and did presentations on radio, television, in theaters, schools, universities and public entertainment houses.

In 1994, the government conferred on Barboza the National Order of Merit award, for his work dedicated to the composition and the spreading of Paraguayan music.