Louis Couperin

None of Couperin's music was published during his lifetime, but manuscript copies of some 200 pieces survive, some of them only rediscovered in the mid-20th century. The first historically important member of the Couperin family, Couperin made contributions to the development of both the French organ school and the French harpsichord school. His innovations included composing organ pieces for specific registrations and inventing the genre of the unmeasured prelude for harpsichord, for which he devised a special type of notation. Provided by Wikipedia
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