Chromatic mediants

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Chromatic mediants, or a chromatic mediant relationship is a relationship between two chords whose roots are related by a major third or minor third, contain one common tone, and share the same quality, i.e. major or minor. For example, the chords C major and A major are chromatic mediants, as are F minor and D minor.

Chromatic mediants have been used in Western classical music since the Renaissance but it was not until the Romantic period that chromatic mediants were used more extensively by composers.