Altramar Medieval music ensemble.
Ars Antiqua L'Ars antiqua et la polyphonie médiévale. French music.
Medieval Music & Arts Foundation Online resources.
Medieval Music (800-1450) Gregorian chant, Hildegard of Bingen.
Perotin Perotinus Magnus.
Queen Blanche of Castile Bianca di Castiglia (1188-1252).
Best historical Italian sites Top 100