Collection of vocal pieces (8)
I believe the answer is:
songbook
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">collection of vocal pieces</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for songbook that I've seen before include "musical collection" , "Collection of music" , "Collection of vocal pieces" , "More than one score from this" , "Volume containing lyrics, hymns, etc" .)