"Jack Tarr the Sailor"

I listened to Ballad of Easy Rider yester-day and found in "Jack Tarr the Sailor" the same sort of construction that I noticed in "It's All Over Now, Baby Blue" in the fall:  the lines "And as I roamed the streets of Bath, the whores, they all would roar, / 'There goes Jack Tarr that poor sailor; he must go to sea once more'" contains a pleonasm, and while this redundant "they" isn't necessary grammatically, it does provide a sense of amount (for "all").