I'd audition for Captain Hammer.  While not quite as tall and good looking as Nathan, I'm pretty buff.  Plus, my singing voice fits his better than NPH's.

But if I couldn't land that role (entirely possible since there are many, many better singers than me in this world, country, state, city…apartment building) I'd try for the gay guy who backs up the groupies.

And I'd sing Everybody's a Hero to audition.

I'd be in the pit. Piano, keyboard (not the same as piano, believe you me), trumpet or tenor sax (and no, I can't play all sax — not a transposing issue but an embrasure issue… unless tuba or valved trombone are options, in which case, they'd be options for me, too). My violin is only at the beginning stages. (I still have trouble stringing the darned thing.) My singing has been on a brief 21(+?) year hiatus. I can still sight-read pretty well. My music memorization is pretty good still (though anything else has gotten rather iffy). I haven't really tried improv in over 8 years. Gave it all up for a career in compy wrangling.

Or an extra. I've done that, too… once… only.

Or handling graphic design (only 1 year hiatus, still remember most of the copyright and legal identity requirements and rules, but I'm slowing losing the RAM regarding all that).