This is at best a decent snapshot I am sorry to say. The hairy heads are very distracting and in need of shampoo and conditioning. Ok seriously now... A better crop without the fore ground would benefit. I don't know if you planned it but, I like how the guitar cought the lighting focusing your attention on it. The focus is ok it may be my monitor but could be a little sharper. The over all lightening is a bit dark could have been a little lighter but, I know you had no control there.. Composition is fine (except the heads). Everything else leads to just an average snap shot. Would have loved to heard the tune he was ripping.
Photos with audience's heads rarely work unless they have their hands in the air or there's amazing lighting on them. The resulting effect here is that of a snapshot. Compositionally, why have all that space to the right? He's looking to the left, leading the eye out of the shot. Put him on the right.