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←== Modulation ==
→Full Circle
Above is the list of the keys from Cb to C#. Note that this is actually 15 tones. Since C# = Db, Cb = B, and F# = Gb, we can eliminate them, leaving with only the 12 distinct tones on the circle of fifths.
''Modulation'' is the practice of changing keys. The source and destination keys are important. Many composers only modulate into destination keys based on the 4th or 5th of the source key, as these are the most harmonic keys.