Josquin's Pange Lingua Mass is loosely based on a plainchant hymn intended to be sung on Maundy Thursday or at Corpus Christi. A slightly earlier composer might have placed the whole chant of the hymn in one voice: Josquin instead quotes a few notes here and there but assigns them to all the voices in turn, as imitation between voices was a new source of musical structure. The Kyrie is a little gem, with sections in triple, duple and then again triple time, each ending in a different harmonic region, while the whole movement remains melodically quite unified.