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.