If it isn't too late to respond to Leslie's comment above, "Robin Cushee" is a corruption of "King Robin quo she". The earliest copy of the song is "Scotch Moggy's Misfortune", an English reworking of a Scots's ballad, somewhat bawdy, which may be found in the Scarce Songs 1 file at www.erols.com/olsonw, and in the broadside ballad index there. There's also an ABC there of the earliest known copy of it's tune.