Evan Kasprzak's Gene Kelly-esque audition was a standout from season 4 auditions. He has released a video of that routine.
Uploaded by Razznakazz
It turns out this routine was choreographed by Ryan Kasprzak, I'm assuming Evan's brother. He's a performer and choreographer based in New York. Amongst many other things, he appeared in Revolution with our own Allison Holker. Check out his choreography reel and his full site for much more.