piano

piano
piano1
/pee an"oh, pyan"oh/, n., pl. pianos.
a musical instrument in which felt-covered hammers, operated from a keyboard, strike the metal strings. Cf. baby grand, concert grand, grand piano, spinet, square piano, upright piano.
[1795-1805; short for PIANOFORTE]
piano2
/pee ah"noh/; It. /pyah"naw/, Music.
adj.
1. soft; subdued.
adv.
2. softly. Abbr.: p, p.
[1675-85; < It: soft, low (of sounds), plain, flat < L planus PLAIN1]

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I

Keyboard instrument with wire strings that sound when struck by hammers operated by a keyboard.

It was invented in Florence by Bartolomeo Cristofori before 1720, with the particular aim of permitting note-to-note dynamic variation (lacking in the harpsichord). It differs from the older clavichord in that its hammers (rather than tangents) are thrown at the strings and bounce back, permitting the struck string to vibrate loudly. A cast-iron frame is needed to withstand the strings' tremendous tension. Pianos have taken various shapes. The original harpsichord (or wing) shape has survived in the modern grand piano; the less-expensive square (actually rectangular) piano, standard in the early 19th century, was replaced by the upright piano, in which the strings are vertical. For at least 150 years the piano was the most important instrument in Western music.
II
(as used in expressions)

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also called  pianoforte,  French  piano , or  pianoforte,  German  Klavier,  

      a keyboard musical instrument (keyboard instrument) having wire strings that sound when struck by felt-covered hammers operated from a keyboard. The standard modern piano contains 88 keys and has a compass of seven full octaves plus a few keys.

 The vibration of the strings is transmitted to a soundboard by means of a bridge over which the strings are stretched; the soundboard amplifies the sound and affects its tone quality. The hammers that strike the strings are affixed to a mechanism resting on the far ends of the keys; hammer and mechanism compose the “action.” The function of the mechanism is to accelerate the motion of the hammer, catch it as it rebounds from the strings, and hold it in position for the next attack. Modern hammers are covered with felt; earlier, leather was used. The modern piano has a cast-iron frame capable of withstanding the tremendous tension of the strings; early pianos had wood frames and thus could only be lightly strung. Modern pianos are therefore much louder than were those of the 18th century, an increase in loudness necessitated in part by the size of 19th-century concert halls. Of the three pedals found on most pianos, the damper pedal on the right lifts all the felt dampers above the strings, allowing them all to vibrate freely; the left pedal shifts the keyboard and action sideways to enable the hammer to strike only one of the two or three unison strings of each tenor and treble key (the bass notes are only single-strung); and the middle pedal (generally available on grand pianos but also found on some upright pianos) usually holds up the dampers only of those keys depressed when the pedal is depressed.

      Credit for priority of invention has been much disputed, but there is little doubt that it belongs to Bartolomeo Cristofori (Cristofori, Bartolomeo), who devised his gravecembalo col piano e forte (“harpsichord with soft and loud”) in Florence in approximately 1709. This was not the first instrument using keyboard striking action; examples of the piano principle existed as early as about 1440. Cristofori had arrived at all the essentials of the modern piano action by 1726, and it is from Cristofori's piano that the modern piano stems.

      The piano, made in a variety of forms, was widely popular in the mid-18th century. Preferring a lighter, less-expensive instrument with a softer touch, German piano makers perfected the square piano. When Wolfgang Amadeus Mozart (Mozart, Wolfgang Amadeus) and Muzio Clementi (Clementi, Muzio) began to write for the piano, a distinctively pianistic style of playing and composing developed. From that point on, the piano became the preferred medium for salon music, chamber music, concerti (concerto), and song accompaniments.

      By roughly 1860 the upright piano had virtually replaced the square piano for home use. Early upright pianos were made according to the design of upright harpsichords (harpsichord) with the strings rising from keyboard level. They were consequently very tall, and many were made in elegant shapes. But by taking the strings down to floor level, John Isaac Hawkins made the upright shorter and more suitable for small rooms.

      A number of developments followed in the 19th and 20th centuries. String tension, determined at 16 tons in 1862, increased to as much as 30 tons in modern instruments. The result is a dynamic range, sostenuto (ability to sustain a tone), and tonal spectrum unknown to Frédéric Chopin (Chopin, Frédéric), Ludwig van Beethoven (Beethoven, Ludwig van), and even Franz Liszt (Liszt, Franz). A significant development in the 20th century (beginning in the 1930s) was the appearance of the electronic, or electric, piano, which relied on electroacoustic or digital methods of tone production and was heard through an amplifier and loudspeaker. See also barrel piano; player piano.

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Universalium. 2010.

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