What is a breaf paragraph about piano?

The piano is a popular musical instrument that produces sound by hammers striking strings. It is classified as a keyboard instrument. The strings are stretched over a soundboard, which amplifies the sound. Pianos range in size from small upright models to large concert grand pianos that can measure over 9 feet in length. Pianos are popular in both classical and popular music, and are used for solo performances, chamber music, and orchestral accompaniment. There are two main types of pianos: acoustic pianos and electronic pianos. Acoustic pianos produce sound through the vibration of strings, while electronic pianos use electronic signals to create sound.