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BWV, Bach Werke-Verzeichnis (Index to Bach's Works). The initials, preceding nos., which indicate the catalogue nos. of J. S. Bach's works in the thematic index (Thematisch-Systematisches Verzeichnis der musikalischen Werke von Johann Sebastian Bach) compiled and ed. by Wolfgang Schmieder (1950). Now accepted as standard means of numbering his works, e.g. St John Passion is BWV245.