Bach, Johann Sebastian (1685-1750). Medium: pen and ink on paper. Date: 18th Century. Ursprung der musikalisch-Bachischen Familie; J.S. Bach on his father Johann Ambrosius (No.11) and the latter's twin brother Johann Christopth (No.12); the additional section is in the handwriting of Carl Philipp Emanuel Bach, and was intended for the Bach-biographer Johann Nikolaus Forkel; Provenance: Staatsbibliothek, Berlin, Germany. Photographic rights held by The Bridgeman Art Library.