Check out this show at Urban Stages
Most of the show was photographed with my Sony A9 and Sony 70-200mm F2.8 Lens. That camera is perfect for theater production still and any kind of stage performance where you need to shoot silently. The performers aren't disturbed, the audience dont know you're shooting and you can just fire away. I normally dont shoot at 20 frames a second during a show because I would definitely over shoot, and normally the medium speed is totally fine.