re: << Why is "Derry" "Down"? >>
Maybe a corruption of (Neil Sedaka) "down-down doobie-doo down down"?

re: Deep River Blues / waterfowl
Maybe she had her apron wrapped about her, like the ill-fated Polly Vaughn?
"His arrow was loosed and it flew thru the dark / And his true love was slain as the shaft found its mark / For she'd her apron wrapped around her / and he took her for a swan"

- Who put the bop in the bop-she-bop?
- Who is that there now knocking the window pane?
- Granny, does your dog bite?
- "Oh, where are you going?" said the knight upon the road.
- Oh, where have you been, Lord Randal, my son?
- Hey, look yonder, tell me what's that you see / Marching to the fields of Concord?
- Would you forsake your house and home, /... / To ride with the Blackjack Davey?
- Who do you love?
- Does your chewing gum lose its flavour on the bedpost overnight?
- "How, how, how, how?"
- Did you bring some silver? / Did you bring some gold? / What did you bring me my dear friend / To keep me from the gallows pole?
- What was sent to the soldier's wife / From the ancient city of Prague ?