This fifth of seven volumes in the Complete Works of Tchaikovsky contains three cycles: \Twelve Pieces of Average Difficulty,\"Op.40; \"Six Pieces,\" Op.51; and \"Dumka,\" Op.59.  This Urtext edition is based on the autograph manuscript and/or first edition(s) of the works.  Other editions have also been consulted, whenever justified, with a full explanation of any discrepancies in the Notes.  Obvious slips of the pen and printing errors have been tacitly corrected.  Editorial additions, which have been reduced to a minimum, appear in square brackets.  The composer's peculiarities of notation and original fingering are maintained throughout.  All dates are in the Old Style.  A biography of Tchaikovsky is also included. "