Kyrie - Byrd, Mass for 4 Voices

From William Byrd's Mass for four Voices, the Kyrie. Sung by the Choir of Christ Church, Oxford. Gloria: http://www.youtube.com/watch?v=OfFLVnU3aek Sanctus & Benedictus: http://www.youtube.com/watch?v=XVtK_R7I66s Agnus Dei: http://www.youtube.com/watch?v=4qlgQoVshf4