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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.
In the period lasting from about 1790 to 1860, the Mozart-era piano underwent tremendous changes, which led to the modern form of the instrument. This revolution was in response to a consistent preference by composers and pianists for a more powerful, sustained piano sound. It was also a response to the ongoing Industrial Revolution, which made available technological resources like high-quality steel for strings (see piano wire) and precision casting for the production of iron frames.
Upright pianos, also called vertical pianos, are more compact because the frame and strings are placed vertically, extending in both directions from the keyboard and hammers. It is considered harder to produce a sensitive piano action when the hammers move horizontally, rather than upward against gravity as in a grand piano; however, the very best upright pianos now approach the level of grand pianos of the same size in tone quality and responsiveness. However, one feature of the grand piano action always makes it superior to the vertical piano. All grand pianos have a special repetition lever in the playing action that is absent in all verticals. This repetition lever, a separate one for every key, catches the hammer close to the strings as long as the key remains depressed. In this position, with the hammer resting on the lever, a pianist can play repeated notes, staccato, and trills with much more speed and control than they could on a vertical piano. The action design of a vertical prevents it from having a repetition lever. Because of this, piano manufacturers claim that a skilled piano player can play as many as 14 trill notes per second on grands but only seven on uprights.
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