Nun komm der Heiden Heiland (Emans 140)

This piece is one of the many choral preludes of which the authorship of Johann Sebastian Bach is doubtfull. It did not get a BWV-number, but Emans listed it in his catalogue of doubtfull Bach works, hence the designation "Emans 140". The source is a manuscript, written by Christian Heinrich Rinck. It seems to me a not too reliable copy of an older source, with voices disappearing and reappearing, perhaps to make it more easily playable by the copiist. However incomplete it perhaps is, it is still a nice piece on this famous chorale melody.

Score available here: http://partitura.org/index.php/johann-sebastian-bach-nun-komm-der-heiden-heiland-emans-140