% TeXbook ex 7.7
\def\ifundefined#1{\expandafter\ifx\csname#1\endcsname\relax}
%
+% If we must make titles, do so, before we're Skipped.
+\ifx\mustmakelilypondtitle\undefined\else\makelilypondtitle\fi
+\ifx\mustmakelilypondpiecetitle\undefined\else\makelilypondpiecetitle\fi
+%
% skip if included already
\def\SkipLilydefs{\endinput}
\ifundefined{EndLilyPondOutput}