Somebody probably said this already, but 'I been working on the railroad' was a song sung at a musical revue at Princeton. It was probably a medley, produced by stitching together scraps of popular songs of the time.

When I was in the 7th and 8th grades (not in the same era as the Princeton boys, mind you) we had several such medleys in our songbooks, and we enjoyed them a lot. When my nieces were in grade school, they liked to hear me sing them.

I wonder if today's kids get to sing any medleys.