What does it mean to say that music is deeply moving? Or that music's aesthetic value derives from its deep structure? This study traces the widely employed trope of musical depth to its origins in German-language music criticism and analysis. From the Romantic aesthetics of E. T. A. Hoffmann to the modernist theories of Arnold Schoenberg, metaphors of depth attest to the cross-pollination of music with discourses ranging from theology, geology and poetics to psychology, philosophy and economics. The book demonstrates that the persistence of depth metaphors in musicology and music theory...