This is a general place holder for any part of the ceremony where you'd like to avoid an "awkward silence". This won't apply to every ceremony, but think; handfasting, candle lighting, foot washing, silent vows, etc. Think through about how long this will take and choose accordingly. Thirty seconds might feel like a long time while you are standing up in front of all of your family and friends, but it's not quite long enough for a full song to play, making instrumentals a popular choice for this portion of the ceremony. Alternatively, this is a great time to get creative and have special music (either by track or by performer).