Man, concert photography is HARD! The light was nearly nonexistent, and what little was there was mostly a funky red-orange-yellow color. I'd rented a 50mm f/1.4 lens, but even with the camera set to ISO 1600 and the lens WFO I could barely get the shots.
As I expected, when I got them home the color was hopeless-- there was no way at all to correct it. And they were as noisy as one would expect from the high ISO setting.
Plan B: gritty, high-contrast black & whites.