I always try and pick something that isn't from the scores many people tend to choose (Les Miz, Rent, Phantom, Cats, etc.). It also depends on the show I'm auditioning for. I sing tenor up to a high Gb in chest voice(A on a good day). Here are my last audition songs I used--
--"Everything Old is New Again" from THE BOY FROM OZ got me the role of Tulsa in GYPSY.
--"All I Need is the Girl" from GYPSY got me Tommy Keeler in ANNIE GET YOUR GUN (REVIVAL VERSION), lost me Jack in INTO THE WOODS though.
-- "Cross the Line" from BIG got me Chuck in FOOTLOOSE.
-- "My Strongest Suit" (taken up 2 steps) got me Tony in COPACABANA.
I never think you should use the same audition song for everything. You wouldn't sing OH WHAT A BEAUTIFUL MORNIN' from Oklahoma! at an audition for a show like "The Full Monty" or BIG BLACK MAN for an Oklahoma audition...it just wouldn't make sense.
And if she'll say, "My darling, I'm yours!" I'll throw away my striped tie and my best pressed tweed, all I really need is the girl...