Error in the Sinfonias and two part inventions on the Bach Page The J S Bach page claimed and I quote from the page under other keyboard works The 15 Inventions and 15 Sinfonias BWV 772 801 These are short two and three part contrapuntal works arranged in order of key signatures of increasing sharps and flats omitting some of the less used ones The pieces were intended by Bach for instructional purposes This however isn t true The sinfonias and inventions are NOT written in increasing number of sharps and flats they are written in chromatic order from C up to B omitting some of the lesser used ones I have played most of the sinfonias and inventions in piano and was shocked that someone wrote something as erroneous as this It s like saying that the Well tempered Clavier were written in some random order COMPLETELY NOT TRUE