Originally posted by Just1MoreDave Two points to add to the above: blue and red lights can easily get overexposed. The first shot is a good example of prime conditions for this. The meter sees an overall dark scene and the blue points are too small to impact the meter. So it raises exposure and the blue gets overexposed. It's hard to see this in the dark. You can check the RGB histogram to see if the blue channel is too far to the right.
Actually, from what it appears, those blue lights are LEDs.
LEDs do not play well with modern sensors (camera make doesn't matter, its a universal thing) since they're essentially a 'pure' color and will almost always look awful compared to the rest of the image.
The blues (and the white street lamp, actually) in this shot are LEDs, as an example.
The gist of it is basically that a sensor works by mixing the colors hitting it to make whatever the end color is (almost like an old CRT TV set - its Red/Blue/Green, but gets mixed to produce other colors). When you throw a, say, blue LED at it, you'll get almost pure blue with no red or green, and you wind up with the blues dominating at the expense of everything else.
I don't do concert photography, but I've seen the issue crop up a few times from those shooting under modern stage lighting because it almost lends a blacklight effect to the shots being taken (which is not a good thing).