Good wedding opening songs?

Im trying to help plan the perfect wedding for my friend and shes kind of a rocker, and a groover, and she tries to keep it real you know, and im trying to find some good songs for her wedding, we already have chosen "Ra Ra Riot - Can you tell" for the song when they leave the alter and their married and everything but were trying to find a groovy kind of layed back song like that one and in that sort of genre-style, ya know, and we cant think of anything for when she walks UP the aisle. Any suggestions?