YES, absolutely!!
Elvis - When I grew up, Elvis was known to be in his ivory tower, and I had never seen him "live" in concerts, not even on TV. The only thing I knew was Elvis' movies that they showed to us from time to time on TV. I recently saw a DVD called "Elvis The Way It Is". He was just fabulous, I think there is no singer better than him, even today. He CAN sing anything.
Gilbert Becaud - I "discovered" him only recently. He died in 2001. I am so frustrated!!! He is truly the best performer that I know of.
It is strange how some artists are great, but because one does not pay attention (too busy) or never heard of him/her (through someone else), one just misses the opportunity to know them.
This is a good thread to make us "discover" artists we may potentially like.