Maybe some of you are preparing the chant of the Lord's Passion for the Holy Week. Here you may find the PDF versions that might be useful.
Cantus Passionis Domini Nostri Jesu Chisti Secundum Matthaeum, Marcum, Lucam et Joannem
Chronita DOWNLOAD HERE
Christus DOWNLOAD HERE
Synagoga DOWNLOAD HERE
More very interesting music sources to be found on: