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[[Modes#Pitch Axis Theory|Pitch Axis Theory]] (also see [http://en.wikipedia.org/wiki/Pitch_axis_theory Wikipedia]) is an extreme example of this. It uses chord progressions that all feature a common note - often this note is the root of every chord in the progression. The underlying chords are not diatonic to any one key. Instead, the scale used for melody/lead will change to conform with each chord.
A Am Adim A+
A: I Am: i Awh: io Awt: I+
E--0----------0---------------------1--
B--2----------1----------1----------2--
G--2----------2----------2----------2--
D--2----------2----------1----------3--
A--0----------0----------0----------0--
E--------------------------------------
Note, we have not covered [[Exotic Scales|exotic scales]], such as the whole-half or whote-tone scales yet, which are referenced above as "Awh" and "Awt".
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