What makes them good? Look at the drummer in shot 8, and the guitarist and drummer together in the last shot. The thing those two pictures share is LARGE subjects, with easily-seen features. Shooting toward the lights, your exposures are going rather dark on some of these, and that makes things look black.
I would strongly think about turning the camera tall-ays and shooting one-man shots on the guitarists. It'll give you a larger head size, on just one guy, and will eliminate the competing interest that arises when you have three very small musicians in one frame.
I would allow the spotlighting to over-expose, and bring the exposure level more toward the correct exposure for the bodies, at least on some shots. When the shots are inky black on the musicians, but the spotlights are pegged perfectly, I think you've gotten the exposure too much in favor of the highights.
Do what you can; I thought you had two, ,maybe three shots, that would have made it to the album liner shots on an 80's band....you're not that far away from turning in very solid stuff.