In this eBook, we embark on an exploration of the revolutionary world of acoustic metamaterials. We take readers on a journey through the marvels of engineered materials that redefine our perception of sound. From the theoretical foundations of metamaterials to their real-world applications, it unravels the secrets behind structures designed to orchestrate silence, amplify whispers, and redirect sound waves. The eBook dives into the core concepts of metamaterials, uncovering the art and science behind their creation. Readers will discover how acoustic cloaks and negative density metamaterials can render objects invisible to sound. Also, readers will realize tunable metamaterials and adaptive acoustics that respond dynamically to changing conditions. The eBook goes further, guiding readers through the intricacies of subwavelength imaging devices and acoustic lenses, showcasing how sound manipulation opens new frontiers in acoustics. Additionally, it explores the transformative impact of negative parameters on sound propagation, enhancing acoustic performance beyond conventional limits. Join us to witness the mystery of sound as it unfolds in the secrets of metamaterials, where innovation knows no bounds, and the symphony of science plays on the edge of silence.