I like the look of shot 1. B & W has definitely worked as has the grain. B & W will also make soft focus less noticeable. A tip I picked up from a photographer friend. The bright spot on the gear behind the singer takes away from the focus on the singer. I do like the gear in the shot, but it should not take away from the main focus. You could try some localised brightness adjustments in that area. I think this shot would also work in portrait with just the singer in the shot.

The second shot is pretty much a blurred snap shot. The white balance is off, is fairly soft and the background is quite busy.. I like the sense of motion, but second synch flash could really have helped. Bearing in mind that sometimes flash is not acceptable or annoying to the artist and the audience.

You should really be setting using aperture mode or manual on the largest apeture your lens can handle.
This low light stuff is tough, but the challenge is part of the fun.

Just noticed AL beat me to it