Research->Genre Study->Uncategorized Music->Kepler's Cosmic Harmony
This page provides information about Kepler's Cosmic Harmony (the music of the spheres).
I saw a planetarium show and I found an exhibition of "Kepler's music scale of the planets." I was interested in it, and I gathered information from mailing-lists and web sites. 
Kepler's idea
Kepler was trying to find common rules between music and planet's movement. His harmony of the spheres is based on the relative maximum and minimum angular velocities of the planet measured from the sun. (It is not a music scale in the strict sense of the word since the sound is continuously changing like choking or sliding.) As the planets move in their orbits their velocity is lowest when farthest from the sun and highest when nearest to it. The increase and decrease of speed correspond to the rise and fall of sound that planets produce. The range of sound that the Venus can produce is very small, since its orbit is almost a perfect circle. 
In such a manner, Kepler allotted to the planets the musical intervals. 
Planets and Notes
Planet Note MIDI data
Saturn G1 A1 B1 A1 G1 Download
Jupiter G2 A2 Bb2 A2 G2 Download
Mars F3 G3 A3 Bb3 C4 Bb3 A3 G3 F3 Download
Earth G3 Ab3 G3 Download
Venus  E4 E+4 E4 (+?͂S???̂P) Download
Mercury  A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 A4 E4 C4 A3 Download
Sounds from six planets
The six planets produce six notes and at the most time, they creates dissonant. However, they can be consonant at some point within a long time. Kepler called this "music of planets." The music encyclopedia "Grove" says that it may have happened only ones, perhaps at the time of creation. We can listen to this harmony if we make time go faster. The interval between the Earth and the Venus makes a consonant, so Kepler thought these planes were a husband and a wife. 
Harmony of Planets
Harmony of the Six Planets Download
Harmony of the Earth and Venus Download
Links to related topics
Kepler's Planet Theater The Kepler's imaginary world is reproduced with JAVA and MIDI.