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Key (n.) A family of tones whose regular members are called diatonic tones, and named key tone  (or tonic) or one (or eight), mediant or three, dominant or five, subdominant or four, submediant or six, supertonic or two, and subtonic or seven. Chromatic tones are temporary members of a key, under such names as '' sharp four,'' ''flat seven,'' etc. Scales and tunes of every variety are made from the tones of a key.