who in your opinion is the best singer of all time?

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i think that there are a lot of really good singers out there and my favorite male singers would have to be george strait and kenny chesney i think that they really have a good voice that isn't going to be challenged anytime soon...and then for female i think that carrie underwood is one of the best singers that i have heard in a long time, and its just my opinion like everyone else will have their own, so what about all of you, who do you think the best singer is and why? i would like to take this time to thank everyone for taking the time out of your day to come by and read and review my discussion and hopefully answering, and trying to help me, and i hope that you all have a great day and night tonight, thanks again for taking the time to stop by.