“…[I]n diatonic harmony, when upper partials are added to a chord, it becomes tenser, and more demanding of a resolution — the more the rhythm of a line rubs against the implied basic time, the more “statistical tension” is generated.

The creation and destruction of harmonic and “statistical” tensions is essential to the maintenance of compositional drama. Any composition (or improvisation) which remains consonant and “regular” throughout is, for me, equivalent to watching a movie with only ‘good guys’ in it, or eating cottage cheese.”

Frank Zappa (1940-1993)