Manuscript of opening concerto of cantata <i>Uns ist ein Kind geboren</i>, BWV 142, formerly attributed to <a href="https://en.wikipedia.org/wiki/Johann_Sebastian_Bach" class="extiw" title="w:Johann Sebastian Bach">w:Johann Sebastian Bach</a>
<a href="https://en.wikipedia.org/wiki/Christian_Friedrich_Penzel" class="extiw" title="w:Christian Friedrich Penzel">w:Christian Friedrich Penzel</a>
<a rel="nofollow" class="external text" href="https://www.bach-digital.de/receive/BachDigitalSource_source_00001999">Digitised manuscript</a>, Bach Archive, Leipzig