Common tone (scale)
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See also: Common-tone modulation and Common tone (chord)
In music, a common tone is a pitch class that is a member of, or common to (shared by) two or more scales or sets.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/23/Common_tone_example.png/320px-Common_tone_example.png)
In music, a common tone is a pitch class that is a member of, or common to (shared by) two or more scales or sets.