It’s two for one with this sensational singer who can belt out a pair of notes at exactly the same time. Anna-Maria Hefele has become the latest web star after astonishing footage of her “overtone” ...

Anna-Maria Hefele is the furthest thing from a traditional singer, and now a video of her performance is going viral. Hefele can sing using polyphonic overtone techniques, also known as “throat ...

This woman can make the sound of two notes at once. She makes it seem so easy, you'd think it'd be something she learned as a party trick. But the singer, Anna-Maria Hefele, has been doing this ...

Starting with an undertone, Anna-Maria Hefele uses special mouth and tongue movements to filter out sound frequencies. To the ear, it sounds like two separate tones. Millions have seen her on YouTube.

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Her voice sounds like some sort of alien spacecraft hovering over the city. In her video demonstration that has gone viral, Anna-Marie Hefele shows how one person can hit, sustain, and move around the ...

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Normally, when singing, you can adjust the pitch of the tone that you create based on the positioning of your tongue in your mouth, which is a form of air chambering that increases or decreases the ...