is organised thematically, rather than chronologically: BWV 1–224 are cantatas , BWV 225–249 the large-scale choral works, BWV 250–524 chorales and sacred songs, BWV 525–748 organ works, BWV 772–994 other keyboard works, BWV 995–1000 lute music, BWV 1001–40 chamber music , BWV 1041–71 orchestral music, and BWV 1072–1126 canons and fugues