This paper is on architecture, acoustics, and concert halls. One of the most important factors involved in the propagation of sound in an enclosed space is reverberation. This is the effect of sounds persisting for some time after the arrival of the direct sound wave as a result of the strength of multiple reflections of the sound off the walls and other surfaces in a room. To put it simply, the longer a sound is bounced around in a room, the longer is its reverberation time (Hall, p.432).