Romantic music
Traits

The classical period often used short, even fragmentary, thematic material while the Romantic period tended to make greater use of longer, more fully defined and more emotionally evocative themes.

Characteristics often attributed to Romanticism:

In music, there is a relatively clear dividing line in musical structure and form following the death of Beethoven. Whether one counts Beethoven as a "romantic" composer or not, the breadth and power of his work gave rise to a feeling that the classical sonata form and, indeed, the structure of the symphony, sonata and string quartet had been exhausted.
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