In music, the submediant's the sixth tonal degree of the diatonic scale. It's so called because it's a third below the tonic, in contrast to the mediant being a third above the tonic. It's the mediant of the subdominant triad. In music theory, the submediant chord's symbolized by the Roman numeral VI if it's major or vi if it's minor. For example, in the C major scale (white keys on a piano, starting on C), the submediant's the note A; and the submediant chord's A-minor consisting of the notes… (More on Submediant)