It all depends. If a rock concert I doubt if it makes any difference because noise from the stage would make the noise from any kind of camera unnoticeable. For smaller jazz or classical settings where I can be relatively close my preference is a camera with a leaf shutter such as a Retina, Rolleiflex, Rollei 35, even a Super Ikonta B, so that patrons sitting next to me are not annoyed. All my photography is with the consent of the artists. For somewhat larger venues I use a Leica with a 90mm Summicron, again taking care not to annoy those sitting close to me. I write off larger theaters because my seats are too far away and photography is usually prohibited. Met Opera has special platforms installed during dress rehearsals for their staff photographers. Who can compete with that?