Today is the feast of St Didacus, a great miracle worker of the 15th Century, a member of the Franciscan Friars Minor. Fr Aldo Tapparo sang a Mass in his church, St Anthony of Padua, in Headington, and we accompanied the Mass.
St Didacus is given the Common of Confessors, Justus ut palma. The ordinary our polyphonists sang was by Johannes Brassart (c.1400-c.1455), who was from the south Netherlands.
Here is the Introit Justus ut palma, followed by Brassart's Kyrie.
Here are the Gradual Os justi and the Alleluia Beatus vir.
Here is Brassart's Sanctus and Benedictus.
Here is the Offertory with its verses.
More about this Mass here.