. A system of harmony : founded on key relationship, by means of which a thorough knowledge of the rules that govern the combinations and successions of sounds may be easily acquired with or without a teacher . 9*= t- H-. r j- * 6., ±* m & :t=t: mj= II At a the dominant of C is treated as the augmented sixth of B,the enharmonic change being implied. HARMONY. 139 At b the augmented sixth of B is changed back to the dominant ofC. The change is implied here also, but it differs from the first casein that the chord is written according to its resolution, whereas in thefirst case it is not. The chi
. A system of harmony : founded on key relationship, by means of which a thorough knowledge of the rules that govern the combinations and successions of sounds may be easily acquired with or without a teacher . 9*= t- H-. r j- * 6., ±* m & :t=t: mj= II At a the dominant of C is treated as the augmented sixth of B,the enharmonic change being implied. HARMONY. 139 At b the augmented sixth of B is changed back to the dominant ofC. The change is implied here also, but it differs from the first casein that the chord is written according to its resolution, whereas in thefirst case it is not. The chief source of enharmonic modulation is found in the dimin-ished seventh chords. These chords consist of four sounds separated from each other bythree half-tones; thus, B, D, F, A\>. Third Fifth. Seventh. Ninth. It will be found that, no matter in what order they are written,this will hold good ; therefore, any one of the sounds may be in turn,the third, fifth, seventh, or ninth. Thus if A\> be put at the bottomwe get, A\?, B, D, i7, and the A\> being enharmonically 6$, the chordmav be written G$, B, D, F. Therefore, as there are four notes in the chord, it may be writtenin four ways, and obtained from
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