The Wishsong of Shannara
It is the final novel in the Original Shannara Trilogy , with the other two being "The Sword of Shannara" and "The Elfstones of Shannara" . 
<triplet> Original Shannara Trilogy <subj> The Sword of Shannara <obj> has part <subj> The Elfstones of Shannara <obj> has part <triplet> The Sword of Shannara <subj> Original Shannara Trilogy <obj> part of the series <triplet> The Elfstones of Shannara <subj> Original Shannara Trilogy <obj> part of the series