Charles Martin Loeffler's Music for Four Stringed Instruments was composed in 1923, two years before his death. It is the aim of this thesis to investigate the technics used by the composer in the quartet. No attempt is made discuss the life history of the composer nor the aesthetics of his music. Suffice it to say that Music for Four Stringed Instruments is "Dedicated to the memory of Victor Chapman," an aviator killed in World War I, and consists of three movements. The quartet will be discussed from its linear properties gradually leading to the chord progressions and root movements through an analysis of chord structures. Publication of the work was made possible by the Society for the Publication of American Music through a subsidy by the Elizabeth Sprague Coolidge Foundation in the Library of Congress. A second edition score was used in analysis. Recordings are available on Victor Records, performed by the Coolidge Quartet.