A semitone, also called a half step or a half tone, is the smallest musical interval commonly used in Western tonal music, and it is considered the most dissonant when sounded harmonically. It is defined as the interval between two adjacent notes in a 12-tone scale (e.g. from C to C â¯).
The National Labor Union. The first large-scale U.S. union was the National Labor Union, founded in 1866 to organize skilled and unskilled laborers, farmers, and factory workers.
Most union members in 1933 belonged to skilled craft unions, most of which were affiliated with the American Federation of Labor (AFL). The union movement had failed in the previous 50 years to organize the much larger number of laborers in such mass production industries as steel, textiles, mining, and automobiles. These, rather than the skilled crafts, were to be the major growth industries of the first half of the 20th century.