Oh my God, I just saw the clip for "Good Mornin'" in SINGIN' IN THE RAIN and I think I counted about 7 or 8 cuts in the whole sequence. That is pretty impressive for a musical number, especially such an incredibly elaborate one. Today there are about 8 cuts in a 20 second timeframe.
Apart from some mentioned on here, "Make 'Em Laugh" from SINGIN' IN THE RAIN is one of my favorite dance scenes from a movie musical. Donald O'Connor is just too good.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"