The application of geometrical concepts is critical in the contemporary music industry. Modern instruments, powerful sound systems and complex recording technology all rely on geometry for the successful delivery of sound. Geometry is even used to get the most out of home stereo systems. This video shows: * Symmetry and how symmetry is applied on a day to day level by sound engineers. Key mathematical concepts include: single and multiple axes of symmetry. * Angles and how angles are used to record a rock and roll band, and to determine the speaker arrays needed for a dance venue. Key mathematical concepts include: right angle, obtuse angle, straight angle, full circle, angle of incidence equals angle of reflection.