Sacred and secular become distinctly separated, with composers writing for both.

Isorhythmic Motet: talea=rhythmic pattern, color=pitch pattern. Usually applied to tenor, less often to upper voices.

Listen to Compact Set, CD-1, Band 18, Machaut, Mass: Agnus Dei.

Listen to Compact Set, CD-1, Band 21, Landini, Ballata.

Tempus Imperfectum: duple meter.