Since the beginning of the 21st century a thematic catalog of Reger's works and sources has been collected in the Max-Reger-Institut Karlsruhe. Includes in-depth information in a readable form on the complete original works and arrangements, both published and unpublished, completed or fragmentary. Information concerning the genesis, place, and state of sources is presented comprehensively and reflects the current state of research. Soon to become the definitive reference work for Max Reger.