Sumac died Saturday at an assisted-living home in Los Angeles after an eight-month bout with colon cancer, Sumac's friend and personal assistant Damon Devine said Monday.
Few biographical details are clear about the reclusive, raven-haired songstress. She was surrounded by rumors about her life and origins, many of them myths of her own making.
She said she was born in 1927, but Devine said her birth certificate read 1922 and she was 86.
She claimed to be a descendant of the Inca emperor Atahualpa, and played up her Andean origins.
Dubbed the "Peruvian Songbird" and the "Nightingale of the Andes," Sumac's soaring, warbling voice - reported to span well over three octaves - was matched by her flamboyant outfits, studded with gold and silver jewelry, designed to make her look like an Incan princess.
Los Angeles Times music critic Don Heckman called her "a living, breathing, Technicolor musical fantasy - a kaleidoscopic illusion of MGM exotica come to life in an era of practicality."
Sumac's birth name was Zoila Augusta Emperatriz Chavarri del Castillo. Devine said she was born in Cajamarca, Peru, on Sept. 13, 1922.
Sumac married Moises Vivanco, a composer, bandleader and early collaborator who was captivated by her voice, in 1942, the same year she first appeared on the radio.
"She is five singers in one," Vivanco told The Associated Press in 1951. "Never in 2,000 years has there been another voice like hers."
She changed her name to Imma Sumack, with the spelling shortened to Yma Sumac when she came to the United States and signed with Capitol Records.
Sumac appeared in the Sammy Fain Broadway musical "Flahooley," playing an Arab princess in 1951, and in the films "Secret of the Incas" with Charlton Heston in 1954 and "Omar Khayyam" in 1957.
Her American fame would largely fade in the 1960s. She made a rock album called "Miracles" in 1971, reissued in 1998 as "Yma Rocks!"
She lived in Peru and Los Angeles in recent decades, and had few friends.
"She was reclusive and untrusting," Devine said. "She lived a very, very solitary life."
Devine, a professional makeup artist who befriended Sumac 11 years ago, said he would apply her makeup in her elaborate 1950s style every day during her illness.
He said the more her mind faded with age, the more she dwelled on her musical heyday.
"It was always, always, always the '50s," Devine said. "After a while her memory sort of stopped after the late '50s."
Sumac earned a cult following among alternative and lounge music fans in the 1990s, and her music appeared on the soundtracks of many movies, including "The Big Lebowski."
When asked a question about legendary French singer Edith Piaf in an AP interview earlier this year, comedian Jon Stewart quipped: "She's no Yma Sumac."
An exhaustive anthology of Sumac's music, "Queen of Exotica," was released in 2005.
Sumac and Vivanco divorced in 1965. She is survived by their son, Charles.
By Associated Press Writer Andrew Dalton