Abstract
In an analytical commentary, the chapter captures Kepler's contribution to the field of music during his stay in Prague in the years 1600-1612. The study reveals the way in which Kepler connected astronomy with music when interpreting his observations.
The interpretation is mainly focused on Kepler's writing "Harmonices mundi" in which Kepler, in addition to dephonating the third law of the motion of celestial bodies, proposed a completely new interpretation of the affective effect of music, which he based on a completely new concept of the so-called divine proportion (golden ratio).