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 ...

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.

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 ...

Sign up for our Metro US email newsletter to get news, updates, and local insights delivered straight to your inbox! Every now and then someone comes along with an ...

From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or ...