what about Ubi Caritas, good ole GC version... beautiful for a prelude, yes? Ya know, I happened to arrange the Durufle harmonies for solo and organ. You are welcome to use it!
You might try "Mother, At Your Feet is Kneeling." It's a traditional Catholic hymn to Our Lady, but the third verse is specifically for weddings and was very commonly used in the past.
Ralph Vaughan Williams's The Call: "Come, my Way, my Truth, my Life" - in the original version, but please, not the bowdlerized version found in some hymnals.
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