+ SCM systems = score
+ ->book_rendering (outname, paper_book->paper_, default_def, key);
+
+ /* If the score is empty, generate no output. Should we do
+ titling? */
+ if (scm_is_vector (systems))
+ {
+ if (ly_c_module_p (score->header_))
+ paper_book->add_score (score->header_);
+ paper_book->add_score (systems);
+ }