The chapter offers a broad picture of the composer Emil Sjögren’s  (1853–1918) lifelong relationship with the organ. It argues that the organ was Sjögren’s main instrument as a performer, although his output of organ music as a composer is relatively small. Sjögren had studied in Berlin with Carl August Haupt (organ) and Friedrich Kiel (composition and counterpoint) and was a noted interpreter of J.S. Bach’s works. In later years, however, his fame as an organist rested exclusively on his improvisations in connection with church services, which were regarded as unique and attracted large audiences. The article includes separate sections on the Stockholm organs from various epochs that Sjögren played, as well as discussions on his main organ compositions, including the three preludes and fugues and Legender, perhaps the first collection of organ pieces in all keys. His influence on the following "Stockholm school" of organist-composers is also briefly outlined.