Did He or Didn’t He? Who Wrote Bach’s Music? J.S. or His Missus?

Ah, those musicologists! Always messing with our minds. And surely there’s no radical feminist revisionism at work here – or is there? See http://www.telegraph.co.uk/culture/music/classicalmusic/11188153/Did-Bachs-wife-write-his-finest-works.html,