Chappell (PMOT) in his commentary on Robin Hood and The Pindar of Wakefield says that the tune is sometimes called Wakefield on a Green and gives 3 sources for the tune, 2 from lute mss and 1 from virginal ms. He discounts the 2 lute ones as extemporisations on ground bass and gives his tune extracted from the "base and inner parts" of the virginal tune.