The astronomer Kepler believed that there was, or certainly should be, an association between the planets and musical harmony, and the phrase 'harmony of the spheres' has an ancient parentage, originating with Pythagoras in the 6th century BC. His fascination with the relationship between the musical note produced by a plucked string and its length was basically mathematical, and it followed that the musical notes produced by the planets, humming in a particular frequency as they moved through space, must relate to their speed and orbit. A number of composer interested in astrology have produced works based on the planets, the most famous being that written by Gustav Holst.
Encyclopaedia of Astrology (Watkins, ISBN 978-1-905857-71-5
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