I played for this show my senior year in H.S. - 48 years ago. I see now that you miss a lot from the orchestra pit.
Granddaughter Rebekka has a part in the play right now, and a nice little feature in this number.
There is no set choreography for pieces like this. It's all up to the creativity and ability of the local talent.
"Show-stopper" is used advisedly. When I linked the vid on Facebook, one of my friends commented, "This is one of those 'mandatory' song-and-dance numbers that adds nothing to the story line." This is true. But I feel that musical theater isn't just about story line - the stories tend to be on the weak side anyway. It's about a balance among story, song, and dance - and in the case of the Music Man, lots of particularly snappy and clever dialog.
And when he dances, certainly boys, what else - the piper pays him!