| Change of Mode (or mutation) | Occurs when music moves between two parallel keys.
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| Closely Related Keys | Keys that have different tonal centers but that have no more than one accidental difference between their key signatures.
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| Common-Chord Modulations | Use one or more chords that are diatonic to both keys as a kind of hinge or pivot linking the two tonalities.
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| Distantly Related Keys | Pairs of keys that have foreign relationships.
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| Enharmonically Equivalent Keys | Keys which 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 | Same as change of 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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| Relative Keys | When two major and minor keys share the same key signatures.
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| Tonicization | Similar to modulation, but with the new key less strongly established.
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