Here are radio programs of interest from Sao Paulo's Cutural FM for March - listen here on the Internet. Times are local Sao Paulo times, one hour ahead of EST.
At 11:00 on March 18, the Quatuor, 'Impressões da vida mundana' is performed by the Lontano Ensemble and the BBC Singers, under the direction of Odaline de la Martinez. This is from the 2002 Lorelt CD, which seems to be only available at the UK Amazon site.
At 11:00 on March 27, Eleazar de Carvalho conducts the Orquestra Sinfônica da Paraíba in Uirapurú.
At 15:00 on March 31st you can hear parts of a concert of music by Villa-Lobos and Hekel Tavares at the Theatro Municipal do Rio de Janeiro, with the Orquestra Sinfônica Petrobras Pró Música conducted by Roberto Tibiriça. The pianist is Arnaldo Cohen (piano).