88
Keys
52 white · 36 black
12K+
Moving parts
~10,000 in motion
20 t
String tension
Total in a grand
1700
Invented
Bartolomeo Cristofori
An acoustic piano responds directly to touch: real keys → hammers → strings → soundboard.
With 88 keys spanning over 7¼ octaves, the acoustic piano produces sound entirely through mechanical physics — no electronics, no amplification. Because its sound comes from real strings and wood, it must be tuned and cared for like any fine mechanical instrument.
Invention & Origins
Bartolomeo Cristofori (1655–1731)
Harpsichord builder · Florence, Italy · c. 1700
Cristofori was a harpsichord builder who devised the first reliable "hammer action" mechanism. He called his new instrument a "gravicembalo col piano e forte" — literally a harpsichord with soft and loud sounds. The name was shortened to pianoforte, then simply to piano.
Cristofori's design was revolutionary: for the first time, a keyboard player could control volume by touch alone. Three of his original pianos (circa 1720) survive in museum collections today.
Historical Evolution
Early Pianos — Florence, Italy
Cristofori builds the first pianos. These resembled harpsichords but used hammers instead of plucked strings, giving players dynamic control for the first time in keyboard history.
How the Piano Produces Sound
Keys & Hammers — The Trigger
Each key is a lever. Pressing it causes a felt-covered wooden hammer to swing up and strike one or more strings. Cristofori's escapement mechanism makes the hammer fall back immediately after striking, so the string vibrates freely.
Tuning
440 Hz
Standard pitch
A4 — international A440
2×/yr
Minimum tunings
More for new pianos or heavy use
3–4×
First-year tunings
New pianos stretch significantly
Equal temperament: All 12 semitone intervals are adjusted equally so the piano sounds correct in any key. A professional tuner uses a tuning lever and listens for "beats" (interference patterns) to set each string's tension precisely.
Concert & studio use: Concert pianos are tuned before every performance; studio pianos may be tuned several times a week. Proper tuning requires a qualified technician — amateurs risk breaking pins or leaving the piano worse than before.
Care & Maintenance
Stable Environment
Aim for ~20°C and 40–45% relative humidity. Avoid placing near windows, vents, or fireplaces — sudden swings warp the soundboard and pin-block.
Placement
Keep away from direct sunlight and drafts. Choose an interior wall on a flat floor. Sunlight fades finishes and dries out wood over time.
Cleaning Keys
Use a soft, lint-free cloth — lightly dampened if needed. Never let moisture seep between keys. No solvents or oils on the key surface.
Cabinet Care
Dust with a dry microfiber cloth. No furniture polish or wax — buildup damages the finish. Keep the lid closed when not playing to keep dust out.
Objects
Never place drinks, plants, or heavy items on the piano. Spills crack the finish; excess weight causes rattles and can damage internal parts.
Professional Service
Tune at least twice a year. A technician should check action regulation and voicing every few years to maintain consistent touch and tone.
Fun Facts & Trivia
The Takeaway
The acoustic piano is a marvel of engineering and art. Its 10,000+ moving parts respond instantly to a player's touch, making everything from whisper-soft passages to thunderous chords possible. With regular tuning and care — and a dash of talent — an acoustic piano can bring decades of musical joy.