Arranged for solo violin, here is the melody from one of my favorite pieces to play for wedding ceremonies: "Wedding March" from A Midsummer Night's Dream by Felix Mendelssohn. This piece is timeless and is great for the recessional to any wedding ceremony.
Here's Mouret's "Rondeau", a perfect piece to play during wedding ceremonies. It's so upbeat and can be performed during the processional, recessional, or just as guests arrive to set a joyful atmosphere.
