Thursday, July 18, 2024


While Wilson later seem to suspend the quantification of consonance, or as stated here he preferred the word Complexity. His system of measurement was simple the presence of a factor in any form is thus added to other present factors. Some have found it useful so include it here 

This seems to be a good place for this document since it doesn't fall into any of the categories in the archives proper. 

Tuesday, March 26, 2024

On the Diaphonic Cycles.

On the diaphonic cycles. relavant papers: and Upon reflection and looking deeper into also a few points others have pointed out, i thought i would add a few comments. It should be noted that indeed Wilson was not completely satisfied with them compared to other material he ended up pursuiting. There is enough to piece together how he saw them though as there are still useful material here. Often he would use them instead of ETs especially in the context of a fretted instrument where what is equal is the fret distances with strings tuned to alternating 3/2 and 4/3 ( for a start). He had commented to me that it enabled one to form tetrachordal scales (which he saw as a different scale building method than MOS for instance). While with the smaller diaphonic cycles, they easily fall into making good scales often even being Constant Structures, Paul Johnson pointed out that this was not always the case. With larger Diaphonic Cycles we can see that Wilson used these less as scales and more as sets in which to extract smaller scales in the same way it is common for people to so with just the harmonic or subharmonic series on its own. Also relating to how as a substitute for an ET where the process of exstracting smaller sets is also quite common. Wilson thought that dual series offered more in terms of many structures such as a diamond where the gaps are often more filled and the same material is capable of being transposed to at least one other position. Even with his CPS structures we find two 1-3-7-9-11-15 eikosanies in his Dallesandro tuning.

Monday, November 12, 2018

Comma ZigZag Patterns

A new 4 page file has been added to entitled Comma ZigZag Patterns which you can see here Some common comma are used to find their location on the scale tree as an example which could be explanded. Of interest is how the epimores of succeeding zigzags are used to point out the commas inherent in each the scales presented. Also Wilson points out some hidden Epimores in the scale tree. A sample below

Saturday, March 31, 2018

An unusual 22 tone 7- limit tuning

Today's puzzle is a 7 limit 22 tone scale based on a 1 9 15 35 set where the result in the lattice finds each factor is two simple ratio steps from each other. The center tetrad of 0. 3. 4. 20. in 22 tone step units is a 'tetrad' within a hexany whose outer points form two diamonds. The chart in the up left corner reflects Wilson interest in transforming a structure in a given tuning by multiplying the unit sizes, here limited to odd numbers in 22. The choice of units might reflect the all interval sets found in 13 here embedded in 22 as two interlocking diamonds.

Sunday, December 11, 2016


Invited are all memories and/or comments in tribute to Erv Wilson. Please post your own recollections below or just share your thoughts in memory of this man.

Wednesday, June 8, 2016


This 22 tone scale of Wilson's believed to be from 1967 was found in a series of papers, charts and scales based  stellating Hexanies in  i have not seen before. One particular method resulted in the example below which seems to form the core of the scale above. Wilson took the 1-3-7-11 hexany and stellated it with 5 and /5 to complete the 8 basic triads found within which results in the 14 tone structure to the left. The result of this type of stellation has unexpected results. for instance 4 other hexanies are formed each which occurs twice.  All involve the added 5 plus three factors of the 1,3,7,11 set.  Because of the relationship of most of the added pitches to this stellate being 3/2 above and below, to form this 22 tone scale. 4 more hexanies also appear. The result is one of many 22 tone scales that contain a great variety of compact hexany subsets. 

Tuesday, March 1, 2016


This is an unlabelled set of pentatonic scales in rotation in what first appeared to be a process similar to that used in his Purvi papers but was not in the end. Adjacent pages carry the year 1982. This set of 5 limit scales he has mapped over 53 squares with the whole set comprising 17 different pitches. In 53 unit sizes would be 53232323-53232323-9 implying two tetrachordal like blocks of 4/3 repeated with a 9/8 disjunction. Each interval shift involve the difference of a 25/24. The paper deserves more more attention. Comments and observations are welcome on this one.