Elmore, I was in London in my dreams last night, too, but unfortunately you weren't. I was driving around with some nutcase girl who had hitchhiked (or something--can't really recall) with me. In my dream, they had just changed to right-side-of-the-road driving in the UK, and it was wreaking havoc.
I can tell you some "no-no's" for auditions (not necessarily songs--but these are all from personal experience):
1. Do not bring a lyric sheet of a song no one has heard of, with not even chord changes, and expect the accompanist to "intuit" how it goes.
2. Do not bring 8x10 reductions of conductor's scores (more often than not handwritten, with "on the road" corrections scratched into them), especially encased in highly reflective "sheet protectors," and then expect the accompanist to magically sight-read the miniscule piano part from betwixt and between the glares.
3. Do not bring "Glitter and Be Gay" and cut it merciliessly to about 30 seconds with absolutely no sense to your edits, and then, approximately a nanosecond before you begin singing, turn to the accompanist and say, "Oh, I forgot--can you transpose this down a third?"
I'll think of more later, I'm sure I will.
