Final answer:
Eighteenth-century American intellectuals believed in the importance of music and art in American life, transitioning away from aristocratic control towards broader public appreciation.
Explanation:
Eighteenth-century American intellectuals believed that music and art held a significant position in American life, transitioning from being predominantly controlled by the aristocracy to being appreciated by the middle class. The Enlightenment period brought about a shift in the perception of the arts, with neoclassical influences shaping artistic expressions. This change influenced the composition and appreciation of music and art by democratizing access and fostering a broader cultural appreciation.
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