 Stumpf’s scientific contribution to the field of empirical psychology has been in recent years highlighted by several studies. In addition to the numerous studies that explore Stumpf’s relationship to psychologists such as Külpe (W. Baumgartner, 1997), Herbart (M. Kaiser-El-Safti, 2009, 2010, 2011; S. Poggi, 2014), Helmholtz (H.-P. Reinecke, 2003) Wundt (U. Wolfradt, 2011), or to H. Ebbinghaus (see U. Wolfradt &amp; M. Kaiser-El-Safti (eds.), 2010), several other studies have highlighted Stumpf’s diversified contribution to several sub-disciplines of psychology, including the psychology of sound, Gestalt psychology, animal psychology, the psychology of child development, etc. Stumpf’s most important contribution in the field of psychology – understood in the narrow sense of the science of psychical functions – is his Psychology of Sound published in two volumes. (Stumpf, 1883, 1890) The first volume deals with individual sound judgments while the second, dedicated to Brentano, studies the consciousness of simultaneous sounds. According to his initial proposal, Stumpf’s project was to write two more volumes. The third was to focus on musical phenomena such as consonance, dissonance, accords, melodies, etc., while he had planned to study feelings generated by sound (Tongefühle) in the fourth. Part of his research on these issues was published separately in his Beiträge zur Akustik und Musikwissenschaft (9 volumes).