A little while ago the priest decided to clarify what he wants the organ to do at High Mass, and what came out of that process looks very like the rubrics in Adrian Fortescue's Liber Organi. This is good on the whole, and helps to simplify things for planning purposes.
Here is what I have planned.
Prelude and Entrance music Toccata -- Johann Caspar Ferdinand Fischer
Offertory Voluntary Praeludium und Hymn (Lydisch) -- Flor Peeters
Communion Voluntary Canzona -- Johann Kaspar Kerll
Postlude Ballo del Granduca [SwWV 319] -- Jan Pieterszoon Sweelinck
