Unfortunately, CALAMITY JANE is not big on male roles.
There's "Wild Bill" Hickock--Jane's sparring partner. (A direct steal from Annie and Frank in ANNIE GET YOUR GUN, in my opinion.)
There's also Lt. Danny Gilmartin as the "romantic" role in the secondary love story.
The characters are not exactly three-dimensonial--Hickock blusters and argues with Jane quite a bit until he "discovers" he loves her.
Gilmartin is a cardboard character who has to have good looks and sing a couple of romantic ballads.
Regarding your audition, you may want to consider the obvious similarities to ANNIE GET YOUR GUN and try "My Defenses Are Down" or "They Say It's Wonderful."
Hope this helps!
"I say YOU'RE the CUTEST one. No, I say YOU'RE the CUTEST One. And we go on like that from dawn to three."