What Are The Different Parts of a Piano?

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Last updatedLast updated: March 12, 2024
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The piano has remained a beloved and sophisticated musical instrument for centuries, enthralling audiences with its potent resonance and adaptable range of tones. This versatile instrument has featured prominently in compositions spanning various genres, from classical to jazz and beyond. At the heart of the piano lies an intricate network of parts, each contributing to its overall sound and functionality. In this article, we delve deep into the anatomy of a piano, examining the essential components that make it a remarkable fusion of engineering and musical expression.

The Exterior Components


The Cabinet

The cabinet is the external structure that encases the piano’s internal mechanisms. It is usually constructed from high-quality hardwoods like maple, mahogany, or walnut, offering visual appeal and structural stability. The cabinet’s design can range from simple, understated elegance to ornate, intricate carvings, reflecting the personality of its owner or the artistic vision of its creator.

The Lid

The lid is the large, hinged cover that protects the interior of a grand piano. The lid helps project the sound outward when opened, enhancing the instrument’s tonal qualities. Upright pianos also have a lid, albeit a smaller one, that can be opened to adjust the tonality and volume of the sound produced. The lid’s design often complements the cabinet’s appearance, ensuring a cohesive aesthetic.

The Keyboard

The keyboard is the most recognizable and interactive part of a piano, consisting of a series of white and black keys that, when pressed, trigger the internal mechanisms responsible for producing sound. A standard piano keyboard contains 88 keys, with 52 white keys and 36 black keys. The layout of the keys follows a pattern of seven white keys and five black keys per octave.

The Pedals

Pianos typically have two or three pedals, each with a specific function that allows the pianist to modify the instrument’s sound. The most common pedals are the sustain pedal (right), the soft pedal (left), and the sostenuto pedal (middle). The sustain pedal prolongs the sound of the notes played, while the soft pedal reduces the volume and alters the tone. The sostenuto pedal, found mainly on grand pianos, sustains only the notes that are being held down when the pedal is engaged.

The Interior Components

The Soundboard

The soundboard is the heart of a piano’s tonal production. It is a large, flat piece of wood—usually spruce—located beneath the strings. As the strings vibrate, the soundboard amplifies the vibrations, transforming them into the rich, full sound that distinguishes the piano. The quality and craftsmanship of the soundboard significantly impact the instrument’s tonal characteristics.

The Strings

Strings are the primary source of a piano’s sound. They are made of high-tensile steel wire and tightly stretched across the cast iron plate, exerting considerable pressure. A piano typically has over 200 strings, with each note having one to three strings, depending on the pitch. The lower notes have thicker, copper-wound strings to produce a richer sound, while the higher notes use thinner, unwound strings for a brighter, more delicate tone.

The Cast Iron Plate

The cast iron plate, also known as the frame or harp, is the rigid metal structure that supports the tension of the strings. It is designed to withstand the immense pressure exerted by the strings (up to 20 tons in some pianos) and provides overall stability to the instrument. The plate is usually cast in a single piece, ensuring consistent strength and durability.

The Pinblock

The pinblock, or wrest plank, is a thick, laminated hardwood block beneath the cast iron plate. It is responsible for holding the tuning pins, which anchor the strings at the tuning end. The pinblock must be exceptionally stable and resistant to warping or cracking, as any movement can cause the piano to go out of tune.

The Tuning Pins

Tuning pins are the metal pins around which the strings are wound. They are embedded into the pinblock and are used to adjust the tension of the strings, thereby tuning the piano. The tuning pins are turned with a specialized tool called a tuning hammer, allowing a piano technician to achieve the precise pitch required for each note.

The Action

The action is the intricate assembly of levers, hammers, dampers, and other mechanical components that translate the pianist’s touch on the keys into the striking of strings and sound production. Each key on the keyboard is connected to a hammer that strikes the corresponding strings when the key is pressed. The action is responsible for the piano’s responsiveness and touch, allowing pianists to express a wide range of emotions and dynamics in their playing.

The Hammers

The hammers are a crucial component of the piano’s action. They consist of wooden cores covered in dense felt, which softens the impact on the strings, creating the instrument’s distinctive sound. The hammers are precisely weighted and balanced to ensure consistent tone and responsiveness across the entire keyboard.

The Dampers

Dampers are small felt pads that rest on the strings when the keys are not being played. They serve to stop the strings from vibrating, effectively muting the sound. When a key is pressed, the damper corresponding to that key lifts off the strings, allowing them to vibrate freely and produce sound. When the key is released, the damper returns to its resting position, stopping the vibration and ending the note. The sustain pedal, when engaged, lifts all the dampers simultaneously, allowing the strings to continue vibrating even after the keys are released, creating a sustained, resonant effect.

The Bridges

The bridges are wooden supports that transfer the strings’ vibrations to the soundboard. They are carefully shaped and positioned to maximize energy transfer efficiency, ensuring the most vibrant and resonant sound possible. There are two main types of bridges on a piano: the treble bridge, which supports the higher-pitched strings, and the bass bridge, which supports the lower-pitched strings.

The Agraffes and Capo Bar

Agraffes and capo bars are metal components that guide and secure the strings at the speaking end. Agraffes are found on some grand pianos, consisting of individual brass pieces that hold and space the strings, ensuring proper alignment and optimal sound transmission. The capo bar, or capo d’astro, is a continuous metal bar that serves a similar purpose on other pianos, particularly uprights and some grand pianos. These components contribute to the instrument’s overall tuning stability and tonal quality.

Piano Maintenance and Care


Regular tuning is essential to maintain a piano’s optimal sound and performance. It is generally recommended to have a professional piano technician tune your instrument at least once or twice a year, depending on factors such as humidity, temperature fluctuations, and usage. Frequent tuning ensures that the piano stays in pitch and helps prevent potential damage caused by excessive string tension.


Regulation is the process of adjusting the piano’s action to ensure optimal responsiveness and touch. Over time, the various components of the action wear down, causing inconsistencies in the piano’s performance. A skilled piano technician can perform regular regulation adjustments, restoring the instrument’s precision and playability.


Voicing involves adjusting the piano’s tone by manipulating the hammers’ felt covering. As the hammers wear down from striking the strings, their shape and density change, affecting the instrument’s tone. A piano technician can reshape and adjust the hammers, producing a more balanced and consistent sound across the keyboard.

Cleaning and Polishing

Proper cleaning and polishing help preserve the piano’s appearance and protect its components from dust, dirt, and other contaminants. Regularly dust the piano’s exterior with a soft cloth and clean the keys with a damp cloth, followed by a dry cloth to remove any moisture. Use a gentle cleaner and polish designed explicitly for pianos to maintain the finish of the cabinet, lid, and other exterior components.

Humidity and Temperature Control

Humidity and temperature fluctuations can significantly impact a piano’s tuning stability, soundboard, and other wooden components. To maintain the instrument’s health, monitoring and controlling the environment in which the piano is housed is crucial. Ideally, the humidity should be maintained between 40% and 50%, and the temperature should be around 68°F (20°C). Consider using a humidifier or dehumidifier to regulate humidity levels, and avoid placing the piano near windows, doors, or heating/cooling vents to minimize temperature fluctuations.


The piano’s enduring appeal lies in its versatile range and expressive capabilities and the intricate interplay of its many components. By understanding the anatomy of a piano, we can better appreciate the craftsmanship, engineering, and artistry that go into creating these magnificent instruments. Regular maintenance and care are essential for preserving the piano’s performance, ensuring it continues providing joy and inspiration for future generations.

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