What is the primary characteristic harmonic change of the romantic period

The term romanticism, in music, refers to the period from the beginning of the nineteenth century to the beginning of the twentieth century, roughly between 1830 and 1900-1910.

According to Ribeiro (2010), "the origin of romanticism dates back to the classical period: "all the most important classical composers used harmonic ambiguity and the technique of moving quickly between different tonalities without establishing a true tone".

That is, musical Romanticism maintained the classical structure, but with diffuse changes in the tonality of the sound structure, more precise. Free forms, symphonies, instrumental virtuosity, and national movements incorporate elements alien to the strict tone of classicism, and this slowly dissolves.

This libertarian transformation in musical tonality gave rise to a variety of forms, such as waltzes, polonaises, mazurcas, romance, lied, prelude and nocturnal.