I've heard claims of other singers (e.g., Mariah Carey) having a 5-octave range, but Yma was one of the few for whom I could easily believe that was true. An incredible, haunting voice.

Yeah, I thought she'd died some time back -- but that was because I hadn't heard much about her for decades and because I thought her career heyday started earlier than the 1950s.

Here are some YouTubes of Yma Sumac:

Yma Sumac at various ages

Yma Sumac from "Secret Of The Incas" soundtrack

Yma Sumac: Pachamama

Yma Sumac: La pampa y la puna