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.
New York City Carpenters' Strike. 1834 National Trades Union, first attempt at a national labor federation, formed in New York. 1835 Paterson, New Jersey, Textile Strike. 1836 National Cooperative Association of Cordwainers, the first national union of a specific craft, formed in New York City.