Move over Tuvan Throat Singing, there’s a "new bizarre" to hear. It's totally real and no one has messed with the sound.

This is a woman showing off the technique of overtone singing, where the same person sings two notes at once.  It's really freaky.  (Her name is Anna-Maria Hefele, and she sings in an ensemble called Supersonus. (See if you like the band's music.) It sounds like an electronic instrument, but that's her real voice.)