Simon Sechter, Austrian organist, composer, and conductor (d. 1867)
Simon Sechter (11 October 1788 – 10 September 1867) was an Austrian music theorist, teacher, organist, conductor and composer. He was one of the most prolific composers who ever lived, although his music is largely forgotten and he is now mainly remembered as a strict music teacher, most notably of Anton Bruckner.

Carl Christian Müller (1831–1914) compiled and adapted Sechter's Die richtige Folge der Grundharmonien as The Correct Order of Fundamental Harmonies: A Treatise on Fundamental Basses, and their Inversions and Substitutes (Wm. A. Pond, 1871; G. Schirmer, 1898).