Digression and trivia-
Yma Sumac- born Zoila Augusta Emperatriz Chavarri del Castillo, Sept. 12, 1924, but mother's name Summack, and the singer first performed as Imma Sumack. Chavarri del Castillo her father's surname. Her family was in ranching, city home in Lima, ranch at Ichocan. First recorded with Vivanco's Peruvian troupe in Argentina but had previously sung in Lima. The Incan princess claim is publicist's fancy. Married Moises Vivianco and mostly lived in NY. Four to five octave range. Retired in L.A.

The Amy Camus of Brooklyn-Montreal-England story is a hoax (her stage name spelled backwards).