Old-time music is a genre of North American folk music. It developed along with various North American folk dances, such as square dancing, clogging, and buck dancing. It is played on acoustic instruments, generally centering on a combination of fiddle and plucked string instruments, most often the banjo, guitar, and mandolin. The genre is considered a precursor to modern country music. History Reflecting the cultures that settled North America, the roots of old-time music are in the traditional musics of the British Isles and Europe. African influences are notably found in instruments such as the banjo. In some regions French and German sources are also prominent. While many dance tunes and ballads can be traced to European sources, many others are of North American origin. The term "old-time" Old-time music represents perhaps the oldest form of North American traditional music other than Native American music, and thus the term "old-time" is an appropriate one. Fiddlin' John Carson made some of the first commercial recordings...

Centralisation or centralization (see spelling differences) is the process by which the activities of an organisation, particularly those regarding planning and decision-making, framing strategy and policies become concentrated within a particular geographical location group. This moves the important decision-making and planning powers within the center of the organisation. The term has a variety of meanings in several fields. In political science, centralisation refers to the concentration of a government's power—both geographically and politically—into a centralised government. An antonym of centralisation is decentralisation. Centralisation in politics History of the centralisation of authority Centralisation of authority is the systematic and consistent concentration of authority at a central point or in a person within the organization. This idea was first introduced in the Qin Dynasty of China. The Qin government was highly bureaucratic and was administered by a hierarchy...

The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in infrared light. It took place between 1997 and 2001, in two different locations: at the U.S. Fred Lawrence Whipple Observatory on Mount Hopkins, Arizona, and at the Cerro Tololo Inter-American Observatory in Chile, each using a 1.3-meter telescope for the Northern and Southern Hemisphere, respectively. It was conducted in the short-wavelength infrared at three distinct frequency bands (J, H, and K) near 2 micrometres, from which the photometric survey with its HgCdTe detectors derives its name.2MASS produced an astronomical catalog with over 300 million observed objects, including minor planets of the Solar System, brown dwarfs, low-mass stars, nebulae, star clusters and galaxies. In addition, 1 million objects were cataloged in the 2MASS Extended Source Catalog (2MASX). The cataloged objects are designated with a "2MASS" and "2MASX"-prefix respectively. Catalog The final data release for 2MASS occurred in 2003, and is served by the Infrared Science Archive. The goals of this survey included: Detection...