Chanoines Brothers
Basel Switzerland

The chanoines brothers Arthur and Pascal will perform a two voices organum in the style of the 13th century in France. The improvisation is based on a gregorian chant (vox principalis). Each note will be hold by one singer while the improviser will develop a melody (vox organalis) on top of it, playing with the effects of stability of the consonances and instability of the dissonances between the two voices simultaneously sang together. To move to the next tone of the given chant the improviser will show it with his hand moving his finger to an other joint of his hand to show the change of pitch, knowing that each joint defines a pitch. This method with the hand is called the Guidonian hand.