*face palm* A: Stop zooming in to 100%+ to view the image B: Don't underexpose and correct later in post..
try not to take shots where the singer looks like they're about to munch the microphone for dinner..
if you're having trouble in low light use the centre focus point and recompose..
this shot is from 2010, the venue that Air Traffic played is one of the worst in Bournemouth for light. had to crank everything to the max to get a decent shutter speed.
this shot could be blown up to 18x12 for the band / fan and they wouldn't make 1 remark about the noise in the image..