Historically, Champion's original choreography to "Hello, Dolly" - the title song - is considered the most showstopping dance number ever.
The entirety of A CHORUS LINE is so expertly staged, it's impossible to pull out a single number.
My personal favorite staging that I've seen live -- since it comes immediately to mind -- is "The Tunnel of Love" from SIDE SHOW. Having the 4 leads levitating in that giant, flashily lit carnival ride heart against a black stage, while belting out that sweltering song of passion unleashed and brutal honesty, struck me with its simplicity and heightened emotional intensity.
A runner up is "Don't Cry for Me, Argentina", with its simple, yet powerfully memorable revolving balcony. It's probably the most oft quoted staging in Broadway history, as it's even reflected in latter poster art.
There are a ton of others that pop into my head, but I'd have to agree. Seasons of Love stands out.
It could have easily been a very busy number with a montage of things happening throughout the course of the song, but insted it's nothing more than the cast in a straight line, side-by-side, in no particular order.
It's this staging that makes I'll Cover You (Reprise) so much more powerful. Collins begins singing and the cast fills in in their Seasons of Love order right behind him, with an empty spot where Angel should be. Chilling.
Everyone seems to be alternating between staging and choreography. I selected Gower Champions stage of the opening to Carnival, but for choreography (and its execution), nothing beats, Chapter 54, Number 1909, from Seesaw, which was choreographed and staged by (depending who you talk to) Tommy Tune, Grover Dale and Michael Bennett.
Er... not sure if this counts or not because it's not really Broadway, but I love Act One Finales that end it a big mob type scene. Like the Act One Finale of Urinetown and "Where Will You Stand" from Parade.
Oh... I've never seen "Be Our Guest" on stage, but I can imagine that it's probably fabulous.
And it's been said before, but I love the simplicity of "Seasons of Love"
You must think I'm still sixteen.
I dropped out of high school for a reason.
And I don't care if you're pretty. I'm not admitting you are right.
My soul is not a stage.
I won't pretend I'm anything I'm not
In Grey Gardens I thought "Daddy's Girl" into "The Telegram" were staged amazingly well. My heart was beating for most of the song and I think that was due to how effectively Young Eddie was moving about (Sarah Gettlefinger and Erin Davie were great assets also). Musical staging was done by Jeff Calhoun.
If I'm late, excuse me, but I love the ending of Act 1 in "Sunday in the Park with George". I'm talking about the original staging and seeing the whole painting finally come together.