A minor is the submediant of C major; therefore C major is the mediantor relative major of A minor.
The converse is not the case, and where Beethoven uses the submediant major as complementary key in a major first movement he does not subsequently introduce the still more remote and brilliant mediant in the recapitulation.
The submediant is so-called because if the subdominant is taken a 5th below the tonic, the submediant will come midway between it and the tonic, as the mediant comes midway between tonic and dominant.
Key arpeggi are formed from the common chord, that is the tonic, mediant and dominant; they may be practised as running arpeggi in three octaves.
The Mediant or third of the scale is peaceful and calm, and the color Yellow is suggested, with its vital, radiating, sunshiny warmth and comfort.
The exposition ends with some dreamy, pianissimo reminiscences of the closing theme in the mediant keys of F, D and B major, delicately scored for the wood-wind instruments and horns.
It is developed with great brilliancy through a series of mediant modulations, in which the originality of Franck's harmonic scheme is very apparent.
Now, the twelfth reversed is nothing but the fifth or dominant, and the seventeenth becomes, by a double reversion, the third or mediant of the tonic.
Let us say, then, that every tone necessarily contains the tonic its generator, the dominant its engendered, and the mediant which proceeds from the other two.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "mediant" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: dominant; key; keynote; minor; tonality; tonic
