As one of the perpetual questions in the low light arena of live music, I've posted two pieces on equipment for concert photography outlining some recommendations for gear.
Gear Guide: General suggestions for lenses well suited to concert photography, as well as a short list of camera recommendations.
My Kit: A list and descriptions of the gear I personally use show after show, with commentary on why this kit works for me.
These sticky features will receive ongoing updates and refinement, but for now you can find them in the persistent navigation.