I've been to a lot of Christian concerts, my favorite of which is the group Avalon. I've seen them four times.
And one of the best concerts I've ever been to is the "Celebrate Freedom" day-long concert the Dallas/Fort Worth area has every year over the Fourth of July weekend where there may be 20 "big" artists performing throughout the day. Such an awesome event. One of the reasons I miss Texas.
My most recent concert was Josh Groban in February of '05, and it was indeed awesome. What an amazing voice! And he's learned to interact with the audience very well too, and can even be funny! I remember when he was still a "young'un", he was so shy and bashful on stage. Not anymore! He's just amazing. Possibly the only thing that would have made it better is if I had attended with someone other than a retirement age couple who complained the music was turned up too loud, and even insisted on leaving before he finished singing his last song (or, at least what I HOPE was his last song) in order to beat the traffic.
They were friends of mine, sure, our ages made no difference I suppose. But it would have been sooooo much better if I had gone with someone who appreciates the excitement of seeing him live in concert a bit more.