Who's pat rooney?

Ok so im in the fall play at my school and it's called waiting for lefty. there's this one scene, scene 3, (the only scene I'm in actually) and I have to do an imitation of this guy named pat rooney with something called rosy o'grady and soft-shoe...

dancing. I've searched all over google butt I havn't found him. He is real I know that butt... Yeah. So if you know who he is, or at least what soft-shoe dancing is, any advice would be great. Thank you!