It is hardly the best song in the score, but the staging by Michael Bennett and the performance of it by Donna McKechnie, Baayork Lee, and Margo Sappington makes it one of the most memorable numbers in Broadway history.
Check out the Tony performance on that site, and you'll know what makes it so...mind-blowing.
Plus, how could you not love the song? It's so much fun to listen to, the lyrics are so crazy.
"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"