The Canon EF 70-200mm f/2.8 L IS USM Lens is a great event and concert lens. This focal length allows reaching through the group to focus on specific subjects. The wide aperture allows shooting in poorly-lit venues and IS allows handholding at very low shutter speeds. Decent light at this venue allowed me some lattitude to stop down a little for greater DOF while allowing a shutter speed fast enough to stop (mostly) the violin bow motion.
Camera and Lens Settings
170mm f/4.0 1/125s ISO 1000 5616 x 3744px