I have seen bad singers who have taken vocal lessons and become very good.I'm not surprised that @concise disagreed with me but I'm a little floored that the church musician @Chris.B disagreed as well....
So Chris... You mean to tell me that you've never had or seen a member(s) that was either in the choir or wanted to be in the choir but couldn't sing.... singers that are so bad that they throw off the rest of the choir? Really, bro??? Those singers can be taught as well?
I'm not talking out of my behind. I've been involved with music pretty much all of my life which includes singing and playing instruments. I don't agree that people can be taught, especially when they're tone deaf.
If a singer knows they are bad and are willing to work on it, they usually turn out good.
Problem here is some people can't sing but people tell them they can