Re: Horton the Elephant (Seussical) Audition Help
Maybe you would like this monologue: http://www.monologuearchive.com/g/galsworthy_008.html
I don't know if you'll like it, but it reminds me of Horton trying to persuade everyone at the trial that the Whos are real. Of course, it is a little more dramatic though!
As for "Close Every Door", I think it is a good choice! I think it has that same sort of alone-but-optimistic feeling as "Alone In the Universe", and it does remind me of "Solla Sollew" too!
Good luck on your audition! Seussical was my favorite musical I've been in!