Is there a singer whose voice you think is extremely underrated?

I have been a fan of Jennifer Rush for ages and recieved her new album through the post today (it’s called Now is The Hour if anyone wants to check it out!). It always amazes me how underrated she is as a singer (especially here in the UK). Most people know The Power of Love and that’s about it. I think her voice is stunning. Is there anyone that you feel this way about? If so, what song would you recommend that people listen to in order to demonstrate your point?