Even as the wires used in pianos changed from iron to steel, sound quality has remained largely the same. Getty ImagesHow Piano Wires Changed Through Centuries -- Discovery
Since Mozart's time, piano wires have changed in content -- but very little in quality, research shows.
* The wire inside pianos has undergone significant changes between the piano's origins in the early 1700s until the late 1880s.
* Research suggests that piano designers used music wire to reach similar harmonic levels despite working with different metals.
* Piano designers balance tension and stiffness of music wire, but many other factors are considered as well.
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