While most of us struggle to voice one clear, distinct note, polyphonic overtone singer Anna-Maria Hefele can sing two at once, and move them around in separate scales.

The technique, also known as throat singing (usually associated with a less aurally pleasing type) allows her to establish a fundamental note and then move the overtone above it through different notes, creating an astounding, ethereal effect.

The first example Anna-Maria gives at 0:25 is impressive enough, but the video gets truly jaw-dropping between 3:17 and 3:25 when she hits a range of notes in quick succession much like a guitar solo, and at 3:25 when she moves the overtone and fundamental in opposite directions.

(Wear headphones if you can, the notes will be easier to pick out)

The style of singing originates from Mongolia where it is known as "Sygyt".