In all modern music this element is one of the most important. If we refer again to the "Faust" overture of Wagner, we will perceive that although the melodic trend and the pitch of the phrase carry their suggestion, the roll of the drum which accompanies it throws a sinister veil over the phrase, making it impressive in the extreme. The seed from which our modern wealth of harmony and tone colour sprang was the perfect major triad. The _raison d'etre_ and development of this combination of tones belong to the history of music. Suffice it to say, that for some psychological reason this chord (with also its minor form) has still the same significance that it had for the monks of the Middle Ages. It is perfect. Every complete phrase, must end with it. The attempts made to emancipate music from the tyranny of this combination of sounds have been in vain, showing that the suggestion of finality and repose contained in it is irrefutable. Now if we depart from this chord a sensation of unrest is occasioned which can only subside by a progression to another triad or a return to the first. With the development of our modern system of tonality we have come to think tonally; and a chord lying outside of the key in which a musical thought is conceived will carry with it a sense of confusion or mystery that our modern art of harmony and tone colour has made its own. Thus, while any simple low chords accompanying the first notes of Raff's "Im Walde" symphony, given by the horns and violins, would suggest gloom pierced by the gleams of light, the remoteness of the chords to the tonality of C major gives a suggestion of mystery; but as the harmony approaches the triad the mystery dissolves, letting in the gleam of sunlight suggested by the horn. Goldmark's overture to "Sakuntala" owes its subtle suggestion to much the same cause. Weber made use of it in his "Freischuetz," Wagner in his "Tarnhelm" motive, Mendelssohn in his "Midsummer Night's Dream," Tchaikovsky in the opening of one of his symphonies.