Norah Jones is a good shoutJoss stone, Norah jones, Katie Melua
Can't believe nobody's mentioned Grace Slick, Nico or Iris DeMent
Durrrrr it's Annie Lennox, obviously.
You would be.Forgetting her iconic status and unquestionable charisma, she had a terrible voice. If she was going karaoke down the local pub, you'd be glad when she finished singing.