François-Joseph Fétis (French: [fetis]; 25 March 1784 – 26 March 1871) was a Belgian musicologist, composer, teacher, and one of the most influential music critics of the 19th century. His enormous compilation of biographical data in the Biographie universelle des musiciens remains an important source of information today.Fétis was born in Mons, Hainaut, eldest son of Antoine-Joseph Fetis and Elisabeth Desprets, daughter of a famous chirurgical doctor. He had 9 brothers and sisters. His father was titular organist of the noble chapter of Saint-Waltrude.[1] His grandfather was an organ manufacturer. He was trained as a musician by his father and played at young age on the Choir organ of Saint Waltrude. In October 1806 he married to Adélaïde-Louise-Catherine Robert, daughter of the French politician Pierre-François-Joseph Robert and Louise de Keralio, friend of Robespierre. They had 2 sons : most famous was Édouard Fétis, (1812-1909), his eldest son who helpen his father with the editions of Revue Musicale and became member of the Royal Academy. In 1866 his wife died, and he had the request to withdraw from the Brussels society and Court. When his father died Eduard enherited his complete library and collection of music instruments. Less