Defying Gravity by a landslide. It reaches a level that Let it Go doesn't even come close to.
Wowww, I've heard the Elvis Costello version before but this is something else. Love it.
One of many Elvis C song's done better by other people. I get why he recorded it, but this is the movie he and Burt Bacharach wrote it for. Also, if you're talking about a song which works standalone or as a narrative moment, this is very much both. The movie is an overlooked treasure.