Reimann was born in Rengersdorf, Silesia, and was a son of Ignaz Reimann, also a musician. Reimann studied at the University of Breslau and was awarded a degree in classical philology in 1875, having simultaneously studied organ with the Silesian composer and organist Moritz Brosig (1815–1887). It was only in 1886 that Reimann changed his profession to music, becoming active in Berlin as an organist, choral conductor, and write on subjects from Byzantine music through Wagner and contemporary composition.
Reimann was born in Rengersdorf, Silesia, and was a son of Ignaz Reimann, also a musician. Reimann studied at the University of Breslau and earned a degree in classical philology in 1875, concurrently studying organ with Moritz Brosig (1815–1887), a Silesian composer and organist. It was only in 1886 that Reimann switched his career to music, becoming active as an organist, choral conductor, and writer on topics ranging from Byzantine music through Wagner and contemporary composition.