Missa Pro Pace is a modern work that bridges contemporary modal writing with the traditions of liturgical music. It is musically notable for its wide dynamic range and evocative, bell-like sonorities.
Managing the large dynamic shifts and ensuring the sustaining power of the melodic lines are the primary technical hurdles.
Comparable difficulty and character — good candidates for what to learn next.
"Missa Pro Pace" is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of "Missa Pro Pace" lasts about 5 minutes.
"Missa Pro Pace" is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include "Gold..." by Anna Hakobjanyan, "Unconcjuctive...inseparable..." by Anna Hakobjanyan, Bulgarische Suite by Pancho Haralanov Vladigerov — see the full similar-pieces list on this page.