CHAPTER VI 



CHORDS IN THE LIGHT OF THEIR ORIGIN 



50. Description and Summary of Chords Thus Far 



Derived 



At present our list of triads aggregates five in major 

 and six in minor as follows : — 



In 

 Major 



fe^^^^^ 



f II IV V 



VII 



In 



Minor 



iz^II^ZZ ^EE^^iE^ 



11° IV V V Vjf 



This summary presents only three distinct types of 

 triads, the major, the minor, the diminished. The 

 originals of the three types are respectively I in major, 

 / in minor, vii^ in major. All other triad-types are 

 either modifications of the three originals or com- 

 pound chords. 



The structure of a triad is described when we name 

 the exact interval relations of its third and fifth. We 

 describe the major triad as root, large third, pure 

 fifth: the minor triad as root, small third, pure fifth: 

 the diminished triad as root, small third, diminished 

 fifth. When we describe the structure of chord-types 

 we treat each type as chord-material and compute the 

 intervals of components from the chord-root without 

 considering whether or not the chord-root is a har- 



