We have begun using a different arrangement of the Agnus Dei at Mass. This arrangement can be found in chant notation in the Pew Missal on page 30. It is the Agnus Dei from the Missa de Angelis. This beautiful Mass was written in the 15th Century and is one of the oldest and most beautiful Masses we have in the catholic tradition. If you would like to familiarize yourself with the Agnus Dei you can listen here.