With my chorus concert tonight, it was brought to my attention (by Mr. Fullerton) that there is, of course, physics involved in how sound is amplified at concerts. Behind the musicians at a concert, there is a sound shell. Why is it there? It helps amplify the music for the audience. This works by acting as a barrier for the sound waves. The sounds waves travel in all directions, including towards the sound shell, and is reflected towards the musicians and the audience. This not only allows the musicians to hear themselves better, but it helps the crowd enjoy the beautiful music coming from the stage.