If in a studio.......how big/small? Any natural light or all artificial?
If at gigs..........Togs pit or just part of the crowd? Any clues as to lighting (can you go to a gig at the same location and check it out?)
Whichever option............
1. Ear defenders are an absolute must......then you can lean on speakers for stability, without permanently damaging your ears.
2. Wide angles and fast lenses (ideally primes) for the times when you can be close.
3. Longer, but still fast zoom lens, for if you can't get close.
A Nifty Fifty (50mm f1.8) is excellent for this kind of thing, as is a 70-200mm f2.8.
Have fun!!