There are many different styles of music that can be played during the entrance and ceremony. During the service there may be a few hymns, especially in liturgical settings. While some elements of the ceremony may be personalized for a specific couple, the order of service will most of the time follow a similar pattern.
A prelude often precedes the wedding. During the prelude, guests arrive to the gathering place while ambiance music is being played. Calm and light music is usually performed at that time, setting the mood for the ceremony while not being too distracting for the guests. Popular prelude music includes Air on the G string and Jesu, Joy of Man’s Desiring by Johann Sebastian Bach.
Music can be used to announce the arrival of the participants of the wedding (such as a bride’s processional), and in many western cultures, this takes the form of a wedding march. For more than a century, the Bridal Chorus from Wagner’s Lohengrin (1850), often called “Here Comes The Bride”, has been the most popular processional, and is traditionally played on a pipe organ.
Source : Wiki