THE FIFTH BOOK of the title refers to what Stephen Hartke considers his fifth book of madrigals, only two of which books are actually for voices, with the others being for string instruments. Hartke writes madrigals for string instruments due to their inherent singing quality, but also due to the fluid structural character of the madrigal as a genre that often responds in quite mercurial ways to the emotional unfolding of its text. These five movements are thus abstract madrigals whose larger outlines, shifts in mood, and various internal reminiscences are intended to convey a private, unspoken drama. Commissioned for the Brentano String Quartet by the Frankfurt Burgerstiftung im Holzhausenschlosschen sponsored by the Ernst Max von Grunelius-Stiftung.