Views of Notre Dame de Paris accompanied by Perotin's 4-part organum "Sederunt principes," believed to have been composed for performance in that (half finished) cathedral on the feast of St Stephen in 1199. There are excellent older recordings by Alfred Deller and the Deller Consort (Harmonia Mundi France), by David Munrow and the Early Music Consort of London (EMI), and by Paul Hillier and the Hilliard Ensemble (ECM). But the most beautiful performance and recording is by Anthony Pitts and Tonus Peregrinus (Naxos).