As I recall, "Old Devil Moon" is sung by both the female and male leads, Woody and Sharon, in Act I, while they are falling in love. I definitely remember hearing both Ella Logan and Donald Richards sing it on the original cast album.
I did this show in community theater many years ago, and it's a lot of fun. As I recall, we did the Senator's transformation scene by using lighting effects and maybe some smoke to conceal him for a moment, while he pulled on a blackface mask. He might have had blackface makeup on his hands, too, with gloves on over them, so during the "transformation" he just took the gloves off.
The only role I find sort of irritating in this show is Og the leprochaun--I like his song "When I'm Not Near The Girl I Love," but "Something Sort of Grandish" is just too cute for me.
Karen
Maggie-the-schnoodle