It's been many years since I've gone to a concert, but the best would probably have to be

Neil Diamond -- it was not long after Jazz Singer (movie) had been released (a LONG LONG time ago) .... but if memory serves me right, he did 3 or 4 encores ... - originally he had booked for 3 nights in our city (where I lived at the time) and they sold the tickets out so fast that he added another night.

Most of my life I've lived in less populated areas, so concerts haven't always been an easy option .... So the ones I've been able to go to have all been memorable.

3 times to Alabama (in their heyday), George Strait (I'm probably spelling it wrong), Earl Thomas Conley, Gordon Lightfoot (3 times) and of course the Neil Diamond concert mentioned above. It may sound like I mainly was into country/western ... which I do enjoy, but that actually had more to do with what my friends liked, since going to a concert alone wouldn't be any fun at all!