This book provides an alternative (better) way to understand the future of acoustics, especially in the dialectic context of sound and silence-while learning from different approaches in the literature but without favoring any one of them (nor integrating them, since they are not necessarily compatible with each other). In other words, this book offers a new theory (that is, the multilateral theory of acoustics) to go beyond the existing approaches in the literature on acoustics in an original way.