The earliest upright piano was made by Friedrich, a German clavichord manufacturer, in 1750. Nowadays, many families have upright piano. It is family-style and convenient, so people regard it as a tool for entertainment. When friends get together, some people at home learn to play the piano, and all of them use the upright piano. Grand piano is more used for performances and formal occasions. This is a little difference between them. The biggest difference is the mechanical structure of the string striking machine and the keyboard. After striking the string, the hammer needs to return to its original position in time for the next stroke. Compared with the upright piano whose strings are struck from the side, the hammer returns to its original position by its own weight after grand piano strikes the strings from below, which is more labor-saving. Therefore, the single-key combo ability of upright piano is 1 sec 7 times, and that of grand piano is 14 times. The second difference is the pedal. The sustain pedal on the right is the same, but the soft pedal on the left, grand piano, is a variable-speed pedal, and its structure is completely different from that of an upright piano. The principle of the harp soft pedal is to make the harp of the hammer close to the strings and soften the sound; But grand piano's variable-speed pedal makes the whole key move to the right, so the hammer that used to knock three strings can now knock two. In this way, the vibration between the beat string and the chord is opposite and can cancel each other out. This not only brings subtle changes to the volume, but also brings subtle changes to the timbre. Upright piano's center pedal is a mute pedal, which can reduce the overall volume if necessary. However, grand piano's center pedal is a selective sustain pedal. When you press a key and press the center pedal, it will only prolong the sound. The volume of upright piano and grand piano is basically the same, but the sound of the triangle is richer. This is because the dynamic area between extremely weak sound and extremely strong sound is wider, the strength of sound is very clear, and the forms of expression are also rich. In addition, the soundboard of upright piano is on the piano body, and it is box-shaped, so there is always a low feeling. But the sound board of the grand piano is under the cast iron board. As long as the piano cover is opened, the sound will be enhanced, and the sound of playing can be heard immediately, so it is easier to confirm every sound when playing. I hope I can help you ~ ~ ~