Blue Heron -- Kyrie from Missa Cuiusvis toni by Johannes Okeghem (c. 1420-1497) - YouTube
Missa prolationum - Wikipedia
Cuiusvis toni
Theodore Front Musical Literature - Missa Cuiusvis Toni, Upon Re and Mi / edited by Jaap Van Benthem.
Missa cuiusvis toni / musica nova ensemble, lucien kandel de Ockeghem, Johannes, CD x 2 chez melomaan - Ref:119257682
OCKEGHEM,JOHANNES - Missa Cuiusvis Toni & Prolationem - Amazon.com Music
Missa Cuiusvis toni / Missa Quinti toni / Celeste Beneficium: Johannes Ockeghem, Edward Wickham, Clerk The & Group S & Edward Wickham, Ensemble The Clerks'Group, Edward Wickham (direction): Amazon.fr: CD et Vinyles}
Johannes Ockeghem: Kyrie de la Missa Cuiusvis Toni - LeitersBlues