What are the similarities between classical and romantic music?

The Romantic period represented an expansion of structure and expression in Europeanclassical music from the early 19th century to the early 20th century. For all of its departures from the style of the Classical period, it maintained many of the same characteristics.

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what they have in commen is the form and harmany
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Primary colors are red, yellow and blue. Tertiary colors are made by mixing equal parts of one primary color and one secondary color. There are six tertiary colors yellow-orange, red-orange, red-violet, blue-violet, blue-green, and yellow-green.