Louis Couperin was a French composer. He was born in 1626 and died in 1661. He was trained by his father, and went to Paris about 1650 and soon became organist at the Church of SaintGervais. Organist of the royal chapel and a member of the courtorchestra, he was also a brilliant harpsichordist. His music reveals the heritage of the French lutenists and the contrapuntal, colouristic French organ school; it often shows a powerful use of dissonance and an unusual seriousness. Research Louis Couperin
In music, dissonance is that effect which results from the union of two sounds not in accord with each other. The ancients considered thirds and sixths as dissonances; and, in fact, every chord except the perfect concord is a dissonant chord. The old theories include an infinity of dissonances, but the present received system reduces them to a comparatively small number. The most common are those of the tonic against the second, the fifth against the sixth, or (the most frequent of all) the fourth against the fifth. Research Dissonance
 
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