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.
National Labor Union. The National Labor Union (NLU) was the first national labor federation in the United States. Founded in 1866 and dissolved in 1873, it paved the way for other organizations, such as the Knights of Labor and the AFL (American Federation of Labor). It was led by William H. Sylvis.