Somehow you want and expect supersharp technical excellent pics. But those do not always fit the theme. The softness and psychedelic colors might work well with their kind of music, it tells more about the band.
The composition could be better with a move to the right. Include the guitar player, there is enough room at the left. Now it is too centered on the singer, causing the guitar player to be cut off. 6.
I like the effect here, but could have worked better with bounced flash. Not a good idea to have half a performer at both sides of your shot. Singer's mic obscures the eyes of the performer behind him... a no-no. Great colours.