"Mary Ambree" is discussed in Dianne Dugaw's Warrior Women and Popular Balladry 1650-1850 (Cambridge, 1989) [esp. chapter 1: "Popular balladry, Mary Ambree, and the beginnings of the Female warrior motif, 1600-1650"]. In it, she quotes a full version with music, and there are some pictures of broadsides. But I must confess I haven't read the book yet.