XPH308415 The Origin of the Musical Bach Family, (pen and ink on paper) by Bach, Johann Sebastian (1685-1750); Staatsbibliothek, Berlin, Germany; (add.info.: 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;); German, out of copyright.