Pérotin - Viderunt Omnes, Sheet Music + Audio - YouTube

https://www.youtube.com/watch?v=aySwfcRaOZM

Pérotin, Viderunt Omnes. Organum Quadruplum. c.1198 CE. Performed by the Hilliard Ensemble. Pérotin, a pioneer of organum triplum and quadruplum, was a famou...