François Couperin was a French composer. He is the most imporant and best known member of the Couperin family, which consisted of a whole dynasty of composers. Couperin was nicknamed 'Le Grand' (the Great), and is considered to be one of the most seminal composers of the Baroque period, especially in regard to his music for harpsichord. His keyboard music is characterised by a strong idiomatic nature, both in its personal style and in its close relation to the instrument's features.  Next to his harpsichord music, Couperin composed music for organ, vocal music, both sacred and secular, and chamber music. Moreover, he published several theoretical treatises on the playing techniques on the harpsichord and its role in the accompaniment of music.