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A specific composition, like Mass in B minor, would (always) use the capitalised version afaik, like the capitalised S in Symphony in D minor for Franck's symphony;
Used generically, like, "Haydn composed over hundred symphonies", "symphonies" appears without a capital letter, and by analogy, I suppose (but not really sure), "Mozart composed several masses" (non-capitalised version)
Missa explanation is fine, thank you. We have List of masses by Wolfgang Amadeus Mozart but List of Masses by Joseph Haydn, should probably clarify. I'd go with Mozart, plural is genereric, even "composed a mass" would be fine with me, and I also saw "composed a missa brevis", but yes capital when a specific work like the Mass in B minor. --Gerda Arendt (talk) 10:02, 21 March 2018 (UTC)[reply]