I've always enjoyed bad girls in classical literature, and so too have I found the anti-heroine figure in folk songs equally engaging. For example, three songs I've recently enjoyed learning have all included a bad girl or rebel: Three Gypsies for the runaway bride, Rolling of the Stones for the beguiling necromancer, Wild Wild Berry for the inventive poisoner.

Any more?
Your favourite cold-blooded murderesses, sorceresses and down right bad 'uns from traditional songs please!