Kathedrale von Reims, Graduale "Sederunt principes" - Perotinus ca. 1155/65 - ca. 1200/20; Perotinus ca. 1155/65 - ca. 1200/20; Guillaume de Machaut 1300-1377; Guillaume de Machaut 1300-1377 (EMI-Electrola, 1978)