Sébastien de Brossard, pronounced [se.bɑs.tjẽ də brɔ.saːr], (12 September 1655 – 10 August 1730) was a French music theorist, composer and collector.
Brossard was born in Dompierre, Orne. After studying philosophy and theology at Caen, he studied music and established himself in Paris in 1678 and remained there until 1687. He briefly was the private tutor of the young son of Nicolas-Joseph Foucault, a collector and bibliophile. He became a very close friend to Étienne Loulié, one of the musicians who performed the Italianate works that Marc-Antoine Charpentier was composing for Marie de Lorraine, Duchess of Guise, better known as 'Mademoiselle de Guise.' While in Paris, he also became close to Samuel Morland, an English inventor and polymath who was working with Joseph Sauveur, a mathematician, on the Machine de Marly. It was during talks about music with Morland that Brossard deduced the role that a major third versus a minor third play in differentiating a major scale from a minor scale.
These contacts shaped Brossard's future preoccupations. He enthusiastically embraced Italian music; he became a collector of musical manuscripts and music treatises; he perfected his knowledge of musical theory; and autodidact though he was, he honed his compositional skills.
In 1687, Brossard was named a vicar at the Strasbourg Cathedral. He remained there until 1698. He founded an Académie de Musique at Strasbourg in 1687 and arranged Lully's Alceste for performance there. It was during the decade he spent in Strasbourg that he acquired the bulk of his music library, which has since become legendary. A collection of 157 sonatas acquired by Brossard bears the name Codex Rost, after the Cantor at Baden-Baden, Franz Rost (1640-1688). It is sometimes the only source of works by certain German and Italian composers of the 17th century.
In 1698, Brossard was appointed chapel master at the Cathedral of Meaux and remained in that post until 1715. After his retirement, he worked on liturgical publications for the diocese. He died at Meaux in 1730, at age 75.
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