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→Parallel Key
Parallel keys have the same root but different whole-half step patterns. For example, C Major and C Minor are parallel keys. Knowledge of [[Modes|modes]] offer us more parallel keys. Modulation between parallel keys is typically not as closely related as usual. For example, major/minor parallel keys only share 4 notes. However, because they retain the same tonal center, the change is not disruptive.
[http://en.wikipedia.org/wiki/Pitch_axis_theory Pitch Axis Theory] is an extreme example of this. It uses chord progressions that all feature the same a common note - sometimes often this note is the root of every chord in the progression. The underlying chords do are not necessarilydiatonic to any one key. Instead, the scale used for melody/lead will change to conform with each chord.
== Homework ==