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The Missa Festiva "Orbis factor" is a work thought to the Catholic liturgy but can also be interpreted in concert. It contains the complete text of the Gregorian Mass XI that is sung alternately by the Cantor, the Assembly and the Choir. The voices are accompanied by the choir organ, with brief comments of the great organ. The two organs suggest a frame work for implementing grandiose but the work can also be interpreted in a church of modest size and the parties of the two organs reduced to a single organ.