Abstract
In this contribution, a scientific interpretation of musical harmony is understood as a description in an adequate frame of symbolic forms (in the sense of Cassirer), rather than as a final explanation. I describe different interpretations of musical harmony from the time of the Pythagoreans until the present times. It is noted that a symbolic interpretation of Helmholtz (in the sense of his theory of signs), which was criticized as incomplete by Ernst Mach, is recognized as adequate by Arnold Schönberg.