Which song to walk down the aisle to?

Getting married outdoors and am torn between which songs to choose. Either Songbird (cause I love it and it expresses how I feel about H2B). Israel Kamakawiwo'ole's version of Over the Rainbow (as H2B loves this and it sounds like it might suit the location). John Denver's Annie's Song (the lyrics - love the song). Edited to add in Tom Baxter's Better (not the Boyzone version bleurgh!!). Won't let me put it as a poll option now though so if you could say if you think this would be good I'd appreciate it. Really don't know which one would best suit the location and wedding we're having. All advice welcome.

hi FancyPants09 - the song you walk up the aisle to should mean something to you. this is a moment you'll want to remember for the rest of your life and it sounds like Songbird has that meaning to you so that should probably be the piece you select for your grand entrance - all of them are beautiful though!! Siobhan