Liturgies, by their very nature are to teach us something about our faith. St. Augustine once said “he who sings prays twice”. Therefore, any music used in a wedding liturgy should lead people into prayer and enhance the sacred nature of the event.
While guests are arriving at the church before the wedding, instrumental chamber music or sacred songs are appropriate. During the ceremony, liturgical music is in order. Since marriage is meant to be celebrated communally, this music should be somewhat familiar to the guests and contained in the hymnals at the church. If you have a wedding program, you could include the song numbers to help your guests participate.