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Piano (musical instrument), stringed keyboard musical instrument, derived from the harpsichord and the clavichord. Also called the pianoforte, it differs from its predecessors principally in the introduction of a hammer-and-lever action that allows the player to modify the intensity of sound by the stronger or weaker touch of the fingers. For this reason the earliest known model (1709) was called a gravicembalo col piano e forte (Italian for "harpsichord with soft and loud"). It was built by Bartolomeo Cristofori, a harpsichord maker of Florence, Italy, who is generally credited with inventing the piano. Two of his pianos still exist. The case of one, dated 1720, is in the Metropolitan Museum of Art, New York City; the other, dated 1726, is in a museum in Leipzig, Germany. The modern pianoforte has six major parts (in the following discussion, the numbers in parentheses refer to the accompanying diagram of the structure of a pianoforte): The frame is usually made of iron. At the rear end is attached the string plate, into which the strings are fastened. In the front is the wrest plank, into which the tuning pins are set. Around these is wound the other end of the strings, and by turning these pins the tension of the strings is regulated. The soundboard, a thin piece of fine-grained spruce placed under the strings, reinforces the tone by means of sympathetic vibration. The strings, made of steel wire, increase in length and thickness from the treble to the bass. The higher pitches are each given two or three strings tuned alike. The lower ones are single strings made heavier by being overspun—that is, wound around with a coil of thin copper wire. The action is the entire mechanism required for propelling the hammers against the strings (see Operation of the Action below). The most visible part of the action is the keyboard, a row of keys manipulated by the fingers. The keys corresponding to the natural tones are made of ivory or plastic; those corresponding to the chromatically altered tones, of ebony or plastic. The pedals are levers pressed down by the feet.