abstract: The core element of this research paper is an analysis of the B-flat minor prelude and fugue BWV 867. The author’s analysis is then compared with the main contributors to Bach’s analytical studies. An understanding of the work’s structure, together with its motivic and harmonic details, help the performer develop an interpretive approach to the work. Significant Bach scholars, including David Ledbetter and Peter Williams, are used as the source for the additional works to be studied. These scholars also mention close associates of Bach who offer additional insight into his music: Kirnberger and Weiss. The paper includes a brief discussion of the opening chorus fugue BWV 64, instrumental prelude to the cantata BWV 106, chorale prelude BWV 721, and Tombeau sur la Mort de Mr Comte de Logy by Weiss, as they relate to the B-flat minor prelude and fugue. In addition, the analysis provides materials on how the elements of the work relate to the Doctrine of Affections. From the B-flat minor prelude and fugue, the harmonic progressions and figuration are examined from the point of view of the Doctrine. The research also examines the fugue subject, with its unusual leap of a minor 9th, to its structural connection to the opening chorus fugue of BWV 64, and its ties to the Doctrine. Through the analysis of the B-flat minor prelude and fugue and a comparison to works by Bach that are stylistically connected to this work, the author offers insights into the music and its relationship to works that have a sacred text association. / Dissertation/Thesis / Doctoral Dissertation Music 2020