132 



THE NATURE OF MUSIC 



to ask and answer a comprehensive question. Under 

 what conditions does the change from one regnant 

 harmony to another take place ? This change takes 

 place when a hytone of the momentary harmony 

 falls on the efficient accent. The following examples 

 present these bytone-changes on single diatonics, and 

 a few chromatics are also introduced in anticipation 

 of their subsequent explanation. 



i 



3 5 3 



5313 1353 



J=^=T^ 



lY I 



3 15 



-Bh — I 0- 



II 



13 5 1 



'-t^ 



eS: 



\] 



-IV 



etc 



This change also takes place when certain single 

 bond-tones fall on the efficient accent. The first of 

 these bond-tone changes of regnant harmony is 

 reported by the single diatonic sol as follows: — 



5 9 15 



5 5^5915 



i 



m 



i=F- 



i 



-j|) ^^^5^ 



V9 



In this melody from Beethoven's E flat concerto 

 the bond-tone sol instantaneously changes from 1 of 

 V to 5 of I. In such bond- tone changes of regnant 

 harmony two secondary causes cooperate with the 



