- Piano Lessons class="odd">
Other important technical innovations of this era included changes to the groove the piano was strung, such as the good of a "choir" of three strings rather than two for all but the lower notes, and the appliance of different stringing methods
- With the over strung scale, also called "cross-stringing", the strings are placed in a vertically overlapping slanted arrangement, with two heights of bridges on the soundboard instead of just one
- This permits larger, but not necessarily longer, strings to fit within the case of the piano
- Over stringing was invented by Jean-Henri Pape during the 1820s, and first patented for use in grand pianos in the United States by Henry Steinway Jr
- in 1859.
All else being equal, largest pianos with longer strings have better safe and lower inharmonicity of the strings. Inharmonicity is the caliber to which the frequencies of overtones (known as partials, partial tones, or harmonics) depart from whole multiples of the fundamental frequency. Pianos with shorter, thicker, and stiffer strings (e.g., baby grands) have more inharmonicity.