I know this is an etremely late reply but it will be useful to any future Musical Theatre goers who look up songs for auditions etc, like I just did, in future.
For a start, never sing a Les Mis song in a Musical Theatre audition. You may be able to sing it perfectly and have a great character for it, but panel's are sick of hearing these songs and you therefore create competition between yourself and whoever else sings that song (which trust me, will be quite a few people).
Somewhere that's green as mentioned before is a beautiful song to sing but it's not really any use for an audition, it doesn't show off a lot.
You should really take a look at some less known or off stage shows to pick your audition piece. For example, Another Night at Darryl's from Witches of Eastwick is perfect for an alto audition as it has no notes you can't hit, yet it shows off a wide range in this area of your voice. It is also full of character and the panel will remember you as you will likely be the only person to sing this.
The main thing I'm pointing out here is that to have a good audition you must do something different from the crowd or else you will look as though you have taken the easy option and picked the song everybody knows.