Only the other day, a young priest was asking me whether there was a resource for priests to "mug up" on the chants that need to sung at Missa Cantata or High Mass. I said that I felt sure that somebody would have provided something on the internet.
Well they have! The Windsor Tridentine Mass Community has developed a resource to help priests sing the Orations and Readings of the Mass. Mr. Michel Ozorak has created sets of Chant Sheets to assist priests, deacons, and subdeacons.
See: Chant sheets for celebrants
The project is still in progress but I am sure that this will develop into a complete resource for priests wishing to sing the collects, epistles and gospels.