Hello there, actually it will depend pretty much on where you'll be shooting the gig. If you're shooting right up by the stage a mid zoom~(24-70) will do. But for close ups and detail shots, you're probably gonna need your telephoto~(70-200)..
That said, having fast glass is very important so yup, get a 2.8 or faster would help you alot for night gigs. For day-time shows, even a 18-200 would suffice.
Having a fast prime like maybe the 50 1.4/1.8 or even the 85 1.4/1.8 would mean that you might have to move around alot to avoid getting pictures from the same focal length and angles. So yup, my two cents on the lenses.
Enjoy your upcoming shoot!
Cheers!