Notre Dame de Paris

Flying ButtressesAnd Gothic Choirs

Gregory the GreatCarlo Saraceni c 1610

Guido d’Arezzo (994-1033)

Perotin Alleluia Nativitasc 1200

The Cistercian Monks Of Stift Heiligenkreuz

http://www.youtube.com/watch?v=12BKIJq3BoA&feature=fvw

Perotin Alleluia Nativitas

http://www.youtube.com/watch?v=EJxRDhejtwo