This study explores Sibelius's last and, perhaps, most enigmatic Symphony from historical (source-critical), Schenkerian, and transtextual perspectives. Through a detailed study of its genesis, musical architecture, and meaning, the author maintains that the Seventh, its composer, and its generative process, can best be understood as a series of verges: conceptual points of interaction between two or more forces. Verges between Sibelius's nature mysticism and the dramatic biographical circumstances of the period (1914-1924), between inspired and reasoned modes of composition, between genres (symphony and fantasy), between various form types, between tragic despair and hopeful yearning, between innovation and classicism, and between a host of other seeming oppositions, all define the Seventh Symphony and illuminate various facets of the composer's life and thought.

The expressive marking "schattenhaft" appears twice in Gustav Mahler's symphonies: at the beginning of the scherzo in the Seventh and within the first movement of the Ninth. Theodor Adorno's observations regarding Mahler's use of this marking, which connect it to Schopenhauer and Romantic aesthetics, provide the framework for an examination of possible meanings of these two passages in Mahler. Drawing also on references elsewhere in Adorno's book to stylistic and formal features peculiar to Mahler's music, and especially on the comparison he makes between the experiences of reading novels and listening to Mahler's symphonies, this thesis demonstrates that close analysis of the "schattenhaft" passages offers a valuable point of entry into the thinking of both Adorno and Mahler.