If you enjoyed this article, you should read "Relating Tuning and Timbre" (<a href="http://sethares.engr.wisc.edu/consemi.html" rel="nofollow">http://sethares.engr.wisc.edu/consemi.html</a>), which generalizes these ideas to tones with nonharmonic partials. I think it also does a slightly better job at explaining the underlying ideas clearly.