The only all-in-one option is a travel zoom camera, which is like a superzoom but without an eye level viewfinder. Examples of the breed include the Canon SX260 HS, Panasonic ZS-20, and Sony HX30V. These will give you most if not all the zoom you want, but in a compact camera size and look. They will not work well at a rock concert though, unless you are closer to the stage where you can use the wider and brighter end of the lens. You would get better results with video, which is much less demanding than photography.