Steeleye Span also recorded The Black Freighter.

There's probably a generation or two of pop-folkies who probably heard Maddy Prior singing it with Steeleye Span and who've never even heard of Kurt Weill or Bertolt Brecht, which might explain the mystery implied in PoppaGator's
And I find it very curious that the first post which offers "THE BLACK FREIGHTER/PIRATE JENNY" as the title of this lyric omits that very phrase...

Cheers, Rowan