wunder beta📘 Why a piano goes out of tune
You lift a grand piano lid and find a structural machine: steel strings pull in different directions while a cast-iron plate gathers their forces. Steinway describes up to 20 tons of tension acting inside at all times.
What you’ll learn
- The twenty-ton problemSee how a piano distributes constant string tension through metal, wood, and joints.The plate, rim, braces, and strings form a loaded structural system.
- From pin to soundboardTrace the route from a tuning pin and string through bridge, soundboard, and damper.Tuning stability and audibility depend on a chain of mechanical handoffs.
- Why pitch moves after tuningExplain why humidity, friction, unisons, inharmonicity, and duplex scaling affect pitch.A piano's pitch is relational, physical, and sensitive to its environment.
- The craft of holding pitchUnderstand tuning as an instrument-specific listening practice rather than a single-number adjustment.Technicians balance reference pitch, interval relationships, and the piano's own voice.
Questions this course answers
Match each part to its main job.
The piano stays stable because structural, tuning, and acoustic jobs are shared across different parts.
Why is a piano not tuned by forcing every note onto a simple equal-tempered frequency table?
The best-sounding setting accounts for the real string and the real instrument, not only the theoretical scale.
Put the path from key press to room-filling sound in order.
Each stage hands energy to the next: action, string, bridge, then soundboard and air.
Grounded in trusted sources
- Steinway & Sons, The Plate — https://eu.steinway.com/en/a-legend/todays-steinway/plate/
- Alexander Galembo and Lola L. Wogram, Large grand and small upright pianos, Acoustical Society of America — https://acoustics.org/pressroom/httpdocs/146th/Wogram.htm
- Alexander Galembo and Lola L. Wogram, The acoustical properties of large grand and small upright pianos, Acoustical Society of America — https://acoustics.org/pressroom/httpdocs/134th/galembo.htm
- Richard E. Berg and David G. Stork, The acoustics of the piano: Introduction, KTH — https://www.speech.kth.se/music/5_lectures/introd/introd.html
- Sound and Music Institute, The Piano, HyperPhysics, Georgia State University — https://hyperphysics.phy-astr.gsu.edu/hbase/Music/pianof.html
- Johns Hopkins University Hub, Key personnel: piano technician Renée Kelsey — https://hub.jhu.edu/magazine/2024/fall/kelsey-peabody-piano-tech/
Every Wunder lesson is built from real, reputable sources — never invented.
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