Fugue in A minor, BWV 543 by Johann Sebastian Bach, composed between 1708–1713 in Weimar, and copied c 1727 by Johann Peter Kellner; slightly cropped with two pages side-by-side
J. S. Bach
<a rel="nofollow" class="external text" href="https://www.bach-digital.de/receive/BachDigitalSource_source_00001270">Digitised image</a>, manuscript P288 in Berlin