[plt-scheme] music theory (was Natural numbers)

Jos Koot wrote:

> I am not sure that bach used the nowadays equally tempered scale for Das 
> Whol Temperierte Klavier (I have been told differently once by a music 
> teacher)

Bach, a man of taste, probably realized that well-tempered frequencies 
and string divisions could be expressed with exact numbers in Scheme, 
whereas equal-tempered frequencies and string divisions would require 
inexact numbers. --PR