Jean-Odéo Demars, born in Sézanne (France), 2 February 1695, died in Paris, 7 November 1756, was an 18th-century French organist, composer and harpsichordist.
In 1726, he became organist at the Saint-Jacques-la-Boucherie church in Paris. Later, he is appointed organist at Saint-Nicolas-du-Chardonnet church.
He married Geneviève Françoise Legris on February 18, 1734, and they raised seven children. He was the father of musician Hélène-Louise Demars.
As composer he wrote several spiritual songs for the female students of the Saint-Cyr school, near Paris. Fétis wrote that he published an organ book now lost.
We know little else than he was the elder brother of Charles Demars (28 May 1702 - 4 Mars 1774), nicknamed "le cadet", who became in 1728 organist in the Vannes Cathedral, in Brittany, until his death.
In 1735, Charles Demars publishes his 1er Livre de Clavecin. This book contains 4 suites in the Handel manner.
This collection consists of four suites:
Two pieces by Charles Demars played by harpsichordist Claude Nadeau :