Anna-Maria Hefele sings two notes at the same time
J Thoendell stashed this in Music
Source: YouTube Video
overtone singing is a voice technique where it seems like one person sings two notes at the same time.You can sing the overtone scale on one fundamental. Another fundamental has its own overtone scale, so in order to have more overtones to sing nice melodies, you can use different fundamentals and change them while singing.