I dont know what production you are auditioning for, but the current Broadway tour, believe it or not, wants to you act/sing rather than just sing. Just belting 16 bars wont do it. Find something with personality with acting chops. Jason Robert Brown music is difficult to pick and play for a pianist, unless were talking a Broadway caliber audition. A nice baritone number that I use that has an acting base along with some power is Her Face from Carnival. The problem with doing Saigon or Weber, is that it is done to DEATH. Good luck with whatever you choose!
" I wish that the stage were as narrow as a tightrope wire, so that no incompetent would dare step upon it" Goethe