Barbosa was known as the composer to the lower classes of São Paulo, particularly the poor Italian immigrants living in the quarters of Bexiga (Bela Vista) and Brás, as well as the poor who lived in the city's many shanties and cortiços (degraded multifamily row houses). He knew well the Italian-Portuguese pidgin spoken in the streets of São Paulo, mostly in the sections of Mooca, Brás and Bexiga. In 1965, Barbosa wrote "Samba Italiano" (Italian Samba), a song that has Brazilian rhythm and theme, but Italian lyrics with some words with Brazilian influence.