The polyphonic or harmonic, is a kind of song in which the singer manipulates the resonances created as air comes from the lungs up lips, to produce a melody. The frequencies of the voice can be selectively configured by the polyphonic singer, with the change of shape in the cavities of the mouth, larynx and pharynx. This setting allows the singer to create more than one tone at the same time. Here, the singer and musician Anna-Maria Iefele, make us a demo of this capacity.