A few quick comments. I learned Canal Street in Chicago. I was 12 and thought i was terribly wicked. this was 1967. Humoresque has a few other verses starting off with:

Passengers will please refrain
from using the toilet while the train
is standing in the station i love you!
Therefore we urge constipation
while the train is in the station.
If the train can't go then why should you?

From my friend Pete Box formerly of Her Majesty's Ship Ark Royal, Never let your bollocks dangle in the dust. And last but not least one I found in,of all places, the novel Battle Cry by Leon Uris;

Get out your Old grey bustle,
Get your ass out and hustle,
For tomorrow the room rent is due.
Lay it down in the clover,
Let the boys look it over,
If you can't get five take two!
(To the tune of "Your old Grey Bonnet")

Another form of folk music using a very broad brush are marching cadences. I know several disgusting ones. Hey, the Navy promised they would teach me a trade! Neil