The Bodleian Library broadside collection has another copy of THE OYSTER GIRL—with the same lyrics as those posted by Joe Offer above, that begin "Many a knight and lady gay"—but this version (Johnson Ballads 194) also has musical notation for one voice.

The Bodleian has even provided a MIDI file: click to play. (It's a good thing, too, because the online image is partly illegible.)