Three improvisations released in 1929Â-30 were transferred to musical notation in 1954 by his pupil Maurice Duruflé. Another previously unpublished improvisation which was recently rediscovered among Vierne's posthumous papers was reconstructed and published in musical notation in 2005 by DurufléÂ's pupil Jean-Michel Louchart (b. 1946). These four improvisations join Vierne's transcriptions of works by Johann Sebastian Bach, César Franck and Serge Rachmaninoff in this volume, bringing our complete edition of his organ works to a close.