MUSICAL COMPOSITION

TECHNIQUE 15if t of the string liesbetween the finger and ~ a perfect fourththe bridge, the note ~ from G;will be . -and so on throughout the scale.When harmonies are added to the notes of the scaleof C, one note has to be liable to change and is termedct mutable." This note is D, the second degree, whichmust be the lesser tone from C (/"0) in order tocombine with F and A (the supertonic triad), and thegreater tone from C (i) in order to combine with G.This can be tested arithmetically by calculating theinterval from C to F (t), the perfect fifth from Dto A (I), and the major third from F to A (i), whichwill show that to make t~e chord (~= perfectlyin tune, the interval from C to D must be la, andfrom D to E i. Similar investigation will show thatto combine with G, D must be a greater tone (&)from C in order to make a perfect fourth (t) with G.The minor scale is constituted thus:DiatonioDiatonioeerni tone. Berni tone ......:: .., ==- -= .., :0 g~f4~19 Q f&~19t5f=4f-- ttlL-J L-..I L....J L....J L....JThe ratios of these intervals are as follows :Lesser toneGreater toneMinor thirdPerfect fourthIrs•It