More and more couples are using prerecorded vocal music at their ceremonies, but the effect is similar to that of recorded instrumental music. Since guests don't have anywhere to focus, they'll look at the bridal couple. If you have to use a vocal selection, be prepared to drastically shorten it. Recorded instrumental music works best when used for the processional or recessional. Coleman also mentions that not every wedding has to have a ceremony solo.
Smaller weddings are intimate enough to do without music during the ceremony.
In some cases, instrumental music can add aesthetically to your ceremony. Coleman encourages couples to consider where they place musicians. Sometimes people hire a trio or quartet and put them in the back or in the balcony. I recommend putting them up front where people can see them. However, the right music makes a statement about you as a couple, as well.