Wow, I'm surprised no one has mentioned the bottle dance from Fiddler on the Roof. Genius! Hell...Jerome Robins is a genius all together.
West Side Story has the most incredible choreography the Broadway stage has ever seen. Hands down.
I also agree with "Shoeless Joe" from Damn Yankees. That number is so awesome to watch live. Bob Fosse's choreography is thrilling. So, I'll throw in "Rich Man's Frug" from Sweet Charity as well. My favorite is the "Aloof," followed by the "Heavyweight," and then the "Big Finish." Which obviously happens to be the order they're performed.
Rob Ashford did some wonderful work in Thoroughly Modern Millie with "Forget About the Boy" and the opening number.
Michael Bennett and the entirety of A Chorus Line.
Kathleen Marshall's choreography for the revival of Wonderful Town certainly was creative and looked great. Don't know how her choreography for Grease is though...can anyone tell?
And let's not forget George Balanchine. He was the first choreographer to ever introduce dance into the plot of a musical.
On Your Toes...enough said.
And Agnes de Mille...Oklahoma. Groundbreaking.
Susan Stroman has also done some brilliant work with Crazy For You, the Oklahoma revival, and of course Contact. I hope her choreography for Young Frankenstein does her justice.
There's my little history lesson haha I'm too tired to come up with anything else.
Broadway choreography just isn't what it used to be.
"Somethin's comin', I don't know what it is but it is gonna be great!"
