Then catch this while you can (which won't be for long):
http://www.bbc.co.uk/iplayer/episode/b00gd3c3/Judy_Frank_and_Dean/
It tells you all you need to know. The programme is called Judy, Frank and Dean, but the last two are just there to make up the numbers - it's Judy's gig all the way. I'm not even a Judy Garland fan (in any sense of the term), but the last 14 minutes or so of this are astonishing - her voice is shot, she looks like a freakish dwarf, but there's something going on there that you just can't bottle and sell.