You need luck to get a good closeup from a concert. The light changes within seconds, and the musicians dash around the stage without giving your camera time to focus. So get yourself a camera with fast autofocus and a light sensitive lens. It’s a good idea to set the cameras autofocus to continous.
This is a lucky shot of “Mr. Boombastic” Shaggy from a concert in Vienna. Shaggy’s Music is available from the iTunes Store Artist Page Link.
I did the Black and White conversion with Aperture (discontinued).