A piano or pianoforte is a musical instrument classified as a keyboard, percussion, or string instrument, depending on the system of classification used. The piano produces sound by striking steel strings with felt hammers that immediately rebound allowing the string to continue vibrating. These vibrations are transmitted through the bridges to the soundboard, which amplifies them.
Since the 1980s, digital pianos have been available, which use digital sampling technology to reproduce the sound of each piano note. The best digital pianos are sophisticated, with features including working pedals, weighted keys, multiple voices, and MIDI interfaces. However, with current technology, it remains difficult to duplicate a crucial aspect of acoustic pianos, namely that when the damper pedal (see below) is depressed, the strings not struck vibrate sympathetically when other strings are struck as well as the unique instrument-specific mathematical non-linearity of partials on any given unison. Since this sympathetic vibration is considered central to a beautiful piano tone, in many experts' estimation digital pianos still do not compete with the best acoustic pianos in tone quality. Progress is being made in this area by including physical models of sympathetic vibration in the synthesis software.
Over time, piano playing became a more strenuous and muscle-taxing activity, as the force needed to depress the keys, as well as the length of key travel, was increased. The tonal range of the piano was also increased, from the five octaves of Mozart's day to the 7? (or even more) octaves found on modern pianos.
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