Yma Sumac, The Peruvian Songbird, sings "Chuncho."
The last descendant of the last Inca emperor... She descended like Lisa Gerrard, ascended like a soprano (in this piece she seemed to reach the highest note ever hit by a singer), and could be as diabolical as Diamanda Galas. But she mainly sang folk and pop (in fact, Letterman invited her).