170 



THE NATURE OF MUSIC 



Our next example illustrates two concurrent melo- 

 dies, the subrhythm of one of which is I or 1., while 

 that of the other is |. 



light light heavy 



light heavy light 



heavy light light 



Any of these forms may be the subrhythmic period 

 of, may appear in the smaller and larger periods of 

 the subrhythmic divisions and expansions. In any 

 period the above forms may be simple, compound or 

 mixed. In simultaneous rhythms the possible concur- 

 rences of twos and threes, their compounds and mix- 

 tures are simply endless. A single larger period of 

 simultaneous rhythms may combine the greatest vari- 

 ety of regular and irregular forms. No single music- 

 work is so rich in variety of rhythms as Bach's " Well- 

 tempered Clavichord." Mozart and Beethoven, the 

 former notably in the subdivisions of the subrhythm, 

 the latter in both the subdivision and expansion of the 



