Why piano is the main instrument used in classical period?

While the piano did exist during the classical period, it was not the main instrument used. The most prominent instruments of the classical period included the harpsichord, the clavichord, and the fortepiano. The harpsichord was the preferred instrument for most keyboard music during the early part of the period, known as the Early Classical Period (c. 1750-1780). It had a bright and clear sound that blended well with other instruments. The clavichord, with its delicate and expressive sound, was often used for private practice and composition.

However, the fortepiano, which could produce louder and softer dynamics, gradually gained popularity towards the end of the classical period. It was an important transitional instrument that paved the way for the piano's dominance in the following Romantic period.

It is worth noting that during the classical period, the term "piano" was used to describe any instrument that could play piano (soft) and forte (loud) sounds, which included both the fortepiano and the clavichord. However, the term "pianoforte" was also used to refer specifically to the fortepiano.

In summary, the piano was not the main instrument used during the classical period. It was the harpsichord and clavichord that dominated the era. The fortepiano, which later developed into the modern piano, was beginning to gain popularity towards the end of the period.