Maracanã Symphony Orchestra, conducted by Heitor Villa-Lobos
This LP on the Aries label (LP901) shows up occasionally on eBay and in used record stores.
I'm assuming that the Maracanã Symphony Orchestra is related somehow to the Maracanã Stadium in Rio de Janeiro, built for the 1950 World Cup. I'm not sure if this is a live recording or not.
Good luck finding this disc! But thanks to the Brazilian Concert Music blog you can download the album in MP3 format.