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.
At the same time, the first industrial unions formed in Canada. The most significant of these unions was the Knights of Labor, which originated in 1869 in Philadelphia, Pennsylvania, and spread into Canada beginning in 1881.he first workers to unionize in Canada were skilled artisans, such as printers and carpenters, whose skills were in demand. Their skills gave them bargaining power, and beginning in the mid-19th century they were able to establish craft unions to protect their jobs and the standards of their work.