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.

Hello
what they have in commen is the form and harmany
have a nice day

Dont really know what the answer is

Maybe because it was so unique, a form of art, and they could easily store things in it and no one had ever done that before. i’m not sure but that’s what i think : )