415 or 440 ? Period or modern instruments? Here, we will hear a « modern » violin and organ, at a pitch of 440 therefore, illustrating with virtuoso fingers a fertile page of the rediscovery of Bach at the beginning of the twentieth century. Concertos and cantata sinfonias transcribed by Marcel Dupré (and reputed to be « unplayable » because of their difficulty), sonatas and partitas for violin interpreted in the spirit preceding the baroque revival.