Depends on how low the light gets, generally a D-SLR is much better than a PS camera for this type of photography.
In general, you need high ISO, large aperture (the smallest f number)and a shutter speed of at least 1/125 to freeze slower motion for a sharp blur free photo. Faster motion will need faster shutter speed (1/500 or faster for sports). Image stablization helps to avoid blurring from your own hand shake while holding the camera, does not help blurring due to subject motion. Also try not to zoom out too much because motion blurring worsens as you zoom further out. Using high ISO and large aperture is to allow maximum amount of light to get to the sensor to allow use of faster shutter speed to freeze motion in lower light.
If D-SLR is out of your budget, then a Fuji camera may be a better one than most other PS cameras in low light. Fuji camera has a unique sensor design where the octagonal photosite has 2 photodiodes instead of one. This helps to capture better photo in lower light.
I'm looking for a camera that takes good, clear photos for concerts with low light and lots of motion. I'm not a professional, and I don't need a lot of MP's (images will be 640px