Change of Key | A shift of tonal center that takes place between movements of a composition.
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Change of Mode | Takes place when music moves from one key to its parallel key.
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Closely Related Keys | Keys that have a difference of no more than one sharp or flat between their key signatures.
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Common-Chord Modulation | The use of one or more chords that are diatonic in both keys as a kind of hinge or pivot linking the two tonalities (used to make the modulation smoother).
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Distantly Related Keys | Keys that have a difference of more than one sharp or flat between their key signatures.
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Enharmonically Equivalent Keys | Keys that sound the same but are spelled differently.
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Foreign Relationships | All key relationships that are not enharmonic, parallel, relative, or closely related.
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Mode Mixture | The use of tones from one mode (mode here refers to the major and minor modes) in a passage that is predominantly in the other mode.
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Modulation | A shift of tonal center that takes place within an individual movement.
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Parallel Keys | Major and minor keys that have the same tonic note.
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Point of Modulation | The first chord that seems to be functioning more naturally in the second key than in the first.
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Relative Keys | Major and minor keys that have the same key signature. The relative major of any minor key starts on  (0.0K) of the minor scale, while the relative minor of any major key begins on  (0.0K) of the major scale.
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Tonicization | Similar to a modulation, but the shift of tonal center is shorter in duration.
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