Note: Do not rely on this information. It is very old.
Fetis, Francois Joseph (1784-1871), a Belgian composer, was born at Mons, and educated at the Paris Conservatoire, where, after being for some time organist at Donai, he was professor from 1818 till 1833. In that year he was appointed Director of the Brussels Conservatoire. He has written, besides his operas, sacred music, violin pieces, etc., a treatise on Fugue and Counterpoint, a Universal Biography of Musicians, a Manual for Directors of Orchestra and Military Bandmasters, and a treatise on the Theory and Practice of Harmony.