Ockeghem

the oldest surviving polyphonic requiem

mensuration canons — the most mathematically complex mass of the 15th century

can be sung in any mode

if authentic — the largest simultaneous vocal texture of the Renaissance

every movement is a mensuration canon — two voices singing the same melody simultaneously but in different time signatures; the result sounds different and works

a complete mass that can be performed in any of the four modes — performers choose on the day

if authentic: 36 voices in nine 4-voice canons simultaneously — the largest vocal texture of the Renaissance

the oldest surviving polyphonic requiem; the Introit and Kyrie are in a strange, dark mode

a retrograde canon — the same melody backwards and forwards simultaneously