Andreas Werckmeister (1645 - 1706) Italie Andreas Werckmeister (November 30, 1645 – October 26, 1706) was a German organist, music theorist, and composer of the Baroque era. He was amongst the earliest advocates of equal temperament, and through this advocacy was highly influential to the harmonic basis underlying almost all of subsequent Western music. (Hide extended text)...(Read all) Source : Wikipedia