Music photography, it's a tough gig, well it can be if you do not know what you are doing.
Personally I love it, and am lucky to have done a bit in my time, including capturing Status Quo when Rick was still with us.
My tips and tricks for music photography, I usually use a 28-70 lens on my Nikon D800, this gives me a good range. I also have another camera body which will have a 80-200 on, both lenses can go to a nice open aperture of F2.8, in other words they let the light in, allowing you to use a faster shutter speed to capture the action. I'll never go below 1/125 as you'll probably just get blur, and for the action shots you'll probably need 1/250 and higher.
Some may say I am mad, but I always shoot in manual mode, and have auto ISO on for gigs.I always shoot in RAW as opposed to JPEG, and this enables me to correct any exposure issues in Adobe Lightroom or Photoshop afterwards. Do not be afraid of high ISO, ok you may get noise ( grain), but sometimes that may add to the atmosphere of the finished shot.
Do not use a flash, it will not help you at all, and could just make the artists annoyed ! Learn to use the light at the gig, wait for the moments, a spotlight on the singer, smoke coming through lights. Another tip is to get to know the bands style, research the artists on youtube, look for important moments in gigs, a twirl of the guitar, a crowd singalong, remember what songs these moments happen.
You'll get your own style, and it can be tough due to the constantly changing light, but ultimately it's a great gig ( pardon the pun )
Some of my latest gig work is below when I was asked by the Jimi Hendrix tribute act ' Are you Experienced ' to capture them at Silverstone Classic in July , just as they came on stage the heavens opened, so I and my gear were a tad wet , great results though.