Alvaro Neder writes in AMG:
"In 1940, Pixinguinha joins Benedito Lacerda's regional and begins one of the most fertile periods of Brazilian music, with a perfection of execution not known until then. At this point comes the time when Pixinguinha revolutionizes the Brazilian musical writing, with his sax doing superb improvised counterpoints to the Lacerda's flute melody. New creative and innovative works are born in this phase, like "Ingênuo," "Um a Zero," "Segura Ele," "Sofres Porque Queres," "Proezas do Sólon," "Oito Batutas," "O Gato e o Canário," "Ainda me Recordo," among others."
Enjoy Pixinguinha with Lacerda's Regional in a performance of "Carinhoso" here
Soundclips of Pixinguiha available at AMG