[2009-02-27]. (原始内容存档于2009-07-16). Matthews, Elizabeth. Novel approach struck a chord with Inverness writer. The Inverness Courier. 30 March 2007 [2009-02-27]
are built from a major and a minor thirds, the major chord from bottom to top, the minor chord the other way around. Robert E. Wason, Viennese Harmonic