The book "Musical illusions and the truth about expressiveness" was written by Johannes Weber, a musicologist and composer of the 19th century. In this work, the author explores the essence of musical illusions, revealing the secrets of their origin and influence on the perception of music. Weber illuminates the process of creating expressive musical images, revealing the internal mechanisms that lead the listener to feel what is embedded in musical works. The book is a valuable source for understanding musical aesthetics and deepening knowledge in the field of music theory. Considering the topic of expressiveness in music, the author offers new approaches and research that make this book a must for anyone interested in music and its inner world.