FSU,
Song choice for AMDA should be something your completely comfortable with, is within your range, and best shows off what you can do with a tune. They don't want to just hear you sing, they want to see you act the song. They want to see you find those moments in the piece, and make them your own. Make a connection to the tune, whatever it may be. So choose something your comfortable with, perhaps something you've done a lot in the past, something you know cold, and are really able to dig into. I graduated from AMDA a couple of years ago, and have been working ever since. It's a great school, you get out of it, what you put into it. Don't get distracted by the bu#$%^t, that comes along with going through a conservatory program in NY. Just enjoy the experience, and be the sponge! Learn all you can, there are some great professors at that school, who really know their stuff, and want to teach. So go for it! Break a leg!!
When dame fortune tosses me a curve, I never give away to despair, I hang on with every little nerve, trying to keep my balance as I dangle in air.