Final answer:
The main difference between Classical and Romantic music is their attitudes towards rules. Classical music follows strict rules and has a structured form, while modern music breaks away from traditional structures and experiments with different sounds and rhythms.
Step-by-step explanation:
The main difference between Classical and Romantic music comes from the attitudes towards rules. In the eighteenth century, composers were primarily interested in forms, melodies, and harmonies that provided an easily-audible structure for the music. Classical music followed strict rules and had a more structured and predictable form. On the other hand, modern music, including contemporary genres like jazz, rock, and pop, tends to break away from traditional structures and experiment with different sounds, harmonies, and rhythms.