Some listeners may have followed the discussion on CCH about Gattermann's Gelobet seist du ( http://www.contrebombarde.com/concerthall/music/19146
) and his (supposed) Komm o komm du Geist des Lebens ( http://www.contrebombarde.com/concerthall/music/16522
), which turns out to be in fact not by him but by his teacher Johann Philipp Kirnberger. I located the 1786 printing (in an unexpected place) of Komm o komm which identifies Kirnberger as the composer, but I was so happy to have finally found it that it did not occur to me to look beyond, or rather, below the Kirnberger piece. It therefore fell to Auke Jongbloed to notice that the Kirnberger piece is in fact followed, in the 1786 edition, by ANOTHER piece, an unknown chorale prelude by the now-semi-notorious Mr Gattermann. Auke produced one of his fine new reader-friendly scores of it in record time ( http://partitura.org/index.php/samuel-michael-david-gattermann-jesus-meine-zuversicht/
) but insisted that I should "premiere" the piece. And here it is, probably heard for the first time in 200 years or so. More info in the video/video description.