is organised thematically rather than chronologically: BWV 1-222 are cantatas , BWV 225-248 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 1001-1040 chamber music , BWV 1040-1071 orchestral music and BWV 1072-1126 canons and fugues