Love your avatar, VonTussleGirl! Nice seeing that cute face here!
I think "Send In The Clowns" could be very effective sung by a man, quite suave. I could imagine Danny Davis doing it. I have, as a matter of fact (imagined it.)
I don't think a woman can sing "The Unreachable Star" from "Man of La Mancha". It needs the timbre of a man's voice
Salmon leap from the womb of the white sea you look on; they are calves, they are lambs of good color, in peace without slaughter.