I'm currently Working on a 7-limit scale to complement the original pitches I started working on for the piece. This is constructed as a harmonic space1 in two dimensions, five and seven, and can has the following relations:

    49/32    
  7/5 7/4 35/32  
32/25 8/5 1/1 5/4 25/16
  64/35 8/7 40/21  
    64/49    

In notation:

5-7-space-scale.png

![image notation of scale](/assets/images/blog/5-7-space-scale.png)

Since one of my main interests here is to find interesting beating patterns, this particular pitch set provides a few pairs that gives nice patterns. One of these, \(\frac{32}{25}\) against \(\frac{5}{4}\), has a simple rhythmic pattern, given the fundamental is 200Hz, of \(\frac{1}{6}\) as is given by:

\(\frac{1}{200(\frac{32}{25} - \frac{5}{4})}\)

Footnotes:

1

Tenney (2008) On ’Crystal Growth’ in Harmonic Space (1993 - 1998)., Contemporary Music Review.

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