The list below, I am almost certain I found on Fisheaters... somewhere-It was a while ago though. If I am correct, I'm sure one of the mods can provide a link.
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WEDDING MUSIC
Typically, the Sacrament of Matrimony is conducted in one of three
ways:
(1) the Sacrament alone
(2) the Sacrament, followed by a low nuptial Mass, either of the day
or the votive Mass "Pro Sponso et Sponsa"
(3) the Sacrament, followed by a high nuptial Mass, with Gregorian
chant, and possibly sacred polyphony for the Ordinary of the Mass
There are four parts to the typical wedding ceremony: prelude,
processional, interlude, recessional. Suggestions for organ music that would
be appropriate for each part follow.
PRELUDE MUSIC - while guests are being seated
Wachet Auf (Sleepers Awake from Cantata 140), by J.S. Bach
Air on a G String (from the Second Suite, BWV 1068), by J.S. Bach
Schaefe koennen sicher weiden (Sheep May Safely Graze), by J.S. Bach
PROCESSIONAL MUSIC - as the wedding party processes in
Bridal Chorus (from the opera Lohengrin), by Wagner
Canon in D, by Pachelbel
Largo from (aria from the opera Xerxes), by Handel
Where'er You Walk (aria from the opera Semele), by Handel
Trumpet Tune (Prince of Denmark's March), by Clarke
Trumpet Tune, by Purcell
Water Music, by Handel
Royal Fireworks Music, by Handel
Sinfonia (from Cantata 156), by J.S. Bach
INTERLUDE MUSIC - during the ceremony
Panis Angelicus, by Franck
Meditation (from the opera Thais) by Massenet,
Ave Maria, by J.S. Bach
Ave Maria, by Schubert
Clair de Lune, by Debussy
Reverie, by Debussy
Andante Cantabile, by Tchaikovsky
Nocturne (from A Midsummer Night's Dream), by Mendelssohn
Dance of the Blessed Spirits, by Gluck
Gymnopedie #1, by Satie
RECESSIONAL MUSIC - as the wedding party recesses out
Wedding March from a Midsummer Night's Dream by Mendelssohn
Sinfonia (Arrival of the Queen of Sheba) by Handel
Trumpet Voluntary, by Stanley
Alleluja (from the motet Exultate, Jubilate), by Mozart
Allegro (from Spring, the Four Seasons), by Vivaldi
And the Glory of the Lord (from the oratorio Messiah), by Handel
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I personally like "Where'er You Walk", "Air on G String", "And the Glory of the Lord", and "Sheep May Safely Graze"--- We're thinking of using "And the Glory of the Lord" as the recessional and "Air on G" for the processional.