I looked up Amalia Rodriguez on Google and found out she was a famous Portuguese singer (not Brazilian). She specialized in Portugal's famous "fado" music. Here is a Wikipedia article about Fado:
There are musicians today who still specialize in singing Fado style music - I'll have to investigate them too.
Amalia Rodrigues was one year younger than my father. She was born in 1920 and died in 1999. Her music was popular in the 1940's. She was known as the "Queen of Fado" and evidently pushed that style of music into the mainstream and eventually, to the attention of the world.