The classical use of dynamics was reflected in the popularity of a new instrument, the in the classical era.

The correct answer is piano.

Explanation:

The piano is a musical instrument, formed by percussive strings, that is, it sounds when they are struck. This instruments is played through branca and black keys, the first ones create natural notes and the second alternate notes. These keys are tied to small hammers that hit the strings inside the sound box. The piano must be played with both hands and sitting as it has some pedals that accompany the sound.

The piano appears in the 1700s as a need for composers and performers to express their emotions and musical performances. This instrument was invented by Bartolomeo Cristofori. Previously there was the clavichord and the organ.

The piano was imposed as the instrument of keys very popular during the nineteenth century, was the best option to encourage family evenings and restaurants.