Answer:
b.They began to disappear.
Explanation:
The effects of the consonant chord and the dissonant chords on the ears of the listener was recognized in western music as early as 5th century BC.
Consonant chords are harmonious sound and are pleasing to the ears, while dissonant chords are clashing sound and elicits a feeling of tension in the brains. The consonant and dissonant chords affects the human mind. The consonant sounds gives a happy feeling while the dissonant sound gives a sad feelings to our mind.
But in the twentieth-century, Arnold Whittall initiates the changing approaches to the harmony and concept of tonality. The twentieth-century music showed the most diverse in the music world. Consonant and dissonant sounds began to disappear. Arnold Schoenberg develop a theoretical model of music in the twentieth-century known as the "twelve-tone music".
Hence the answer is ----
b.They began to disappear.
The commonwealth of Nations is an organisation uniting the former members of the British Empire: so the answer is: the British Empire.
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The Diagnostic and Statistical Manual of Mental Disorders 5 (DSM-5) has added Gambling Disorder (GD) under Substance-Related and Addictive Disorders. In the previous edition, pathological gambling (PG) used to be part of the section called “Impulse Control Disorders Not Elsewhere Classified" but this has since been changed.
Early European Settlements in North America. American History lessons about the European settlement of North America typically describe Jamestown and Plymouth as the most notable European settlements, but there were several other (and earlier) European settlements in North America by the French, Dutch and Spanish.
