These critico-practical editions by Charles-Marie Widor and Dr. Albert Schweitzer have been a mainstay of organ literature since their publication in 1912. The eight volumes are indexed by the type of composition and offer extensive observations, based on historical evidence and traditional performance, on topics such as registration, ornamentation, and phrasing. A fundamental component of the organist's library. Volume 4 Contents: Prelude (Toccata) and Fugue in F · Prelude and Fugue in F Minor · Prelude and Fugue in G · Prelude (Fantasia) and Fugue in G Minor · Prelude and Fugue in A · Prelude and Fugue in A Minor · Prelude and Fugue in B Minor · Passacglia et Thema fugatum in C Minor.