Multiple scattering is an important and interesting topic, of relevance in a wide variety of physical contexts. In this short paper, we attempt to review some of the theory and applications with the aim of encouraging further investigations. For simplicity, we consider the scattering of two-dimensional time-harmonic acoustic waves by hard parallel cylinders. Methods described include separation of variables, T -matrix methods and integral-equation methods. Our point of view is that the theory… CONTINUE READING