The Sonata in Bm for flute (or recorder) and harpsichord is a work in three movements by Johann Sebastian Bach, catalogued as BWV 1030. The existing autograph manuscript dates from after 1735, when Bach led the Leipzig Collegium. There are errors in the manuscript, and another harpsichord part in G minor that is otherwise the same though transposed, that suggests that this, like the G minor and D major harpsichord concertos, may be among the works Bach transcribed from earlier works originally for other instrumental combinations and in other keys to be playable by performers at hand.
