In 1980, Peter Williams wrote about BWV 565 in the first volume of his "The Organ Music of J.S.Bach". The author warns against numerological over-interpretation like that of Volker Gwinner. Many parts of the composition are described as typical of Bach. Williams sees stylistic matches with Pachelbel, with the north German organ school, and with the Italian violin school, but sees various unusual features of the composition as well. Williams questions the authenticity of the piece, based on its various unusual features, and elaborates the idea that the piece may have a violin version ancestor. The reworked edition of this book, in one volume, appeared in 2003, and devotes more pages to discussing the authenticity and possible prior versions of BWV 565. In the meantime, Williams had written a 1981 article on the authenticity of BWV 565; this was followed by numerous publications by other scholars on the same topic.