Pressing a key on the piano's keyboard causes a padded (often with felt) hammer to strike steelstrings. The hammers rebound, and the strings continue to vibrate at their resonant frequency. These vibrations are transmitted through a bridge to a sounding board that more efficiently couples the acoustic energy to the air. The sound would otherwise be no louder than that directly produced by the strings. When the key is released, a damper stops the string's vibration and the sound. In the Hornbostel-Sachs system of instrument classification, pianos are considered chordophones.
The word piano is a shortened form of pianoforte (PF), the Italian word for the instrument (which in turn derives from the previous terms gravicembalo col piano e forte and fortepiano). The Italian musical terms piano and forte indicate "soft" and "strong" respectively, in this context referring to the variations in sound volume the instrument produces in response to a pianist's touch on the keys: the greater the velocity of a key press, the greater the force of the hammer hitting the strings, and the louder the sound of the note produced. This is in contrast to the predecessor of the piano, the harpsichord, which cannot produce different dynamics depending on how hard the key is pressed.
The International Chopin Piano Competition (Polish: Międzynarodowy Konkurs Pianistyczny im. Fryderyka Chopina), often referred to as the Chopin Competition, is a prestigious pianocompetition held in Warsaw, Poland to honour the name of Frédéric Chopin. It was initiated in 1927 and has been held every five years since 1955. It is one of few competitions devoted entirely to the works of a single composer.
Bösendorfer (L. Bösendorfer Klavierfabrik GmbH) is an Austrian piano manufacturer, now a wholly owned subsidiary of Yamaha. The brand is known for producing pianos with a uniquely rich, singing, and sustaining tone. Bösendorfer is unusual in that it produces 97- and 92-key models in addition to instruments with standard 88-key keyboards. Bösendorfer makes seven models of grand piano (from 5'8" to 9'6") and one vertical piano (52" upright). The 9'6" Imperial Grand is one of the world's largest pianos.