A pianoforte instrument, in particular a piano, has a base. Several bearings serve to support the pianoforte instrument on a floor. A height adjuster is also provided, which permits a height adjustment of the slide element relative to the base and/or a console. A device that facilitates transport is preferably provided on each of the bearings. The device that facilitates transport has a slide element, which permits sliding on the floor.

A keyboard instrument includes keys containing a woody material and including natural note keys and accidental note keys. Each natural note key includes a first playing surface played to produce a natural note. Each accidental note key includes a second playing surface played to produce an accidental note. The first playing surface has a first colorimetric value representing a first color, and the second playing surface color has a second colorimetric value representing a second color. Each of the first and second colorimetric values is derived in accordance with an SCI method in an L*a*b* color space. The first and second colorimetric values satisfy at least one of: a first condition: E*ab17, or a second condition: H*<15 and 1.7<L*/c*<1.7. The first and second playing surfaces differ from each other in at least one of optical reflectance or surface roughness.

A keyboard instrument includes keys containing a woody material and including natural note keys and accidental note keys. Each natural note key includes a first playing surface played to produce a natural note. Each accidental note key includes a second playing surface played to produce an accidental note. The first playing surface has a first colorimetric value representing a first color, and the second playing surface color has a second colorimetric value representing a second color. Each of the first and second colorimetric values is derived in accordance with an SCI method in an L*a*b* color space. The first and second colorimetric values satisfy at least one of: a first condition: E*ab17, or a second condition: H*<15 and 1.7<L*/c*<1.7. The first and second playing surfaces differ from each other in at least one of optical reflectance or surface roughness.

A transportable stringed keyboard instrument includes a lightweight sound-body formed of several layers with front plate and back plate of material of high modulus of elasticity like steel or higher, with a side plate of a material of high modulus of elasticity like steel or higher, bonded to various layers between front plate and back plate. A method of forming a lightweight sound-body includes a single press procedure, wherein the sound-body is formed with bending in opposite direction compared to bending forces due to the string load. An upright piano action is optimized for space reduction so that keys can be positioned closer to the strings and a rotatable action together with the keys form a separate unit for transportation, apart from the sound-body.

A transportable stringed keyboard instrument includes a lightweight sound-body formed of several layers with front plate and back plate of material of high modulus of elasticity like steel or higher, with a side plate of a material of high modulus of elasticity like steel or higher, bonded to various layers between front plate and back plate. A method of forming a lightweight sound-body includes a single press procedure, wherein the sound-body is formed with bending in opposite direction compared to bending forces due to the string load. An upright piano action is optimized for space reduction so that keys can be positioned closer to the strings and a rotatable action together with the keys form a separate unit for transportation, apart from the sound-body.