Here is a fantastic piece of footage, evidently taken from a movie, of Jackson Do Pandeiro and Almira Castilho singing and dancing. I don't really understand the culture here, but it's fascinating.
Incidentally, I found this on a Brazilian blog called 'Forro em Vinil' which specialises in posting mp3s of out of print forro records. My recommendation is to search for the 78rpm records.
Link: Forro em Vinil