I was startled to see "Sing a song o' the city" appear as the original second stanza of "I've been working on the railroad". It reappears, by itself, cleaned up a bit, to a different tune, in _The New Song Fest_:

Sing a song of cities; roll dat cotton bale;
Rustabout am happy, as long's he's out of jail;
Norfolk fo' its oyster shells, Boston fo' its beans;
Cha'leston fo' its rice an' corn, but fo' lassies, New Orleans.

And to that tune, later on, that book also has

'Twas only an old beer bottle, floating on the foam.
'Twas only an old beer bottle, a thousand miles from home.
Inside was a piece of paper, with these words written on:
"Whoever finds this bottle, finds the beer all gone...."

Thereupon I am tempted to chime in with "Man on top of woman...", but never mind.