"I've Got A Feeling I'm Falling" can be sung by anyone--female, male, black, Asian, white, old, young--you name it.
Make sure you've got just a little naughty subtext going on when performing it. This is a family board so I must be a trifle oblique.
At the start of the song someone has just begun to do something truly astounding to you someplace with their tongue, and that "feeling you're falling" just builds and ebbs and flows and makes you all a-tingle. Convey it all with just your voice.
The key here is that you're the only one who knows this subtext. Don't tell anyone about it. Perform the song and see if anyone is smart enough to get it.
Learn the song and the subtext at the same time.
Ain't Misbehavin' is a wonderfully raunchy show--in the nicest way possible. There's a lot of this kind of subtext in the show.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher