German musician Anna-Maria Hefele possesses the remarkable ability to sing two notes simultaneously.
Known as polyphonic overtone singing, the incredible technique enables a gifted few to offer a singing performance in which two different sets of notes are played at the same time using nothing but the sound of a single person's voice.
As a classically trained singer, Hefele is particularly adept at this technique and has been doing it for several years. A popular video uploaded to her YouTube channel shows her demonstrating this unique talent while explaining a little about how it works.