Melody and harmony are like lines and colors in pictures. A simple linear picture may be completely beautiful; the introduction of color may make it vague and insignificant. Yet color may, by combination with lines, create great pictures, so long as it does not smother and destroy their value.
Poetry and music I have banished,
But the stupidity
Of root, shoot, blossom or clay
Makes no demand.
I bend my body to the spade
Or grope with a dirty hand.
The technical history of modern harmony is a history of growth of toleration by the human ear of chords that at first sounded discordant and senseless to the main body of contemporary professional musicians.
Music directly imitates the passions or states of the soul...when one listens to music that imitates a certain passion, he becomes imbued withthe same passion; and if over a long time he habitually listens to music that rouses ignoble passions, his whole character will be shaped to an ignoble form.