Upload & Sell: Off
I don't want to come off mean or harsh, but these are my thoughts after viewing the pictures. I feel like these shots aren't very flattering on the subjects: the longer focal length perspective is isolating the subjects and by shooting front-on you're not conveying a sense of energy or performance. The multi-coloured lighting is playing havoc both with white balancing and causing posterising, especially in the reds. I'd suggest perhaps black and white edits would save some of these pictures for this reason. Also, the high ISO is causing severe noise and chromatic abberation that cheapens the picture quality. In my opinion a lot of the effects are also cheap looking and don't improve the pictures.
My advice would be to use a shorter, fast prime in order to be able to get the wider perspective and shoot at a high shutter speed without having to crank the ISO. I'd also recommend experimenting with standing to the sides of the stage to get pictures across the performers, rather than all being front-on. Some close-ups of the musicians' instruments in action always goes down well too.