Final answer:
Classical music of the eighteenth century is known for its tuneful and easy-to-sing melodies. The Romantic era composers built upon the Classical traditions to create more emotionally expressive music.
Step-by-step explanation:
Classical music of the eighteenth century is characterized by easily identifiable, tuneful, and easy-to-sing melodies. Composers of this period, such as Mozart and Haydn, focused on creating clear musical structures and harmonies. However, it is important to note that the Classical composers were the inspiration for the Romantic era composers who followed. The Romantic composers, like Brahms, Tchaikovsky, and Schumann, also valued melodic qualities in their compositions, but they added more emotional depth and expression to their music.