This ordinary Mass for a cappella chorus can be augmented into so-called Pienary Mass by the addition of parts for organ, which may be selected freely from organ literature or improvised. The whole could then be as follows: Introitus (organ) / Kyrie, Gloria (chorus) / Graduale (organ) / Credo (chorus) / Offertorium (organ) / Sanctus (chorus) / Elevatio (organ) / Agnus Dei (chorus) / Ite missa est (organ). Published in the Chorus series (Ch. 68).