Outdoor ceremony music logistics (XP)

lrmain

So, I'm hoping my MOH will be playing acoustic live during the ceremony, but I want to make sure I have a back-up for music.  My plan was to use one of those battery-powered boom boxes and just burn a CD with the couple of songs that we want, but while that sounds great in theory, I'm a little concerned as to how it'll actually work out.  Since we're getting married on the deck at our venue, we might be able to extention-cord it up and bring better speakers, but I'm trying to go worst case scenarios here.  How have you ladies dealt with this?  Very curious to hear what you did for your nuptials on the beach.