lilypond-book doesn't always add \RequirePackage{graphics} version 2.7.18 /ChangeLog/1.4302/Sun Nov 27 14:37:50 2005/

[Bernard Hurley]

Processing:

----------- test.lytex ---------
%% a comment
\documentclass[english]{article}
\begin{document}
\lilypondfile {test.ly}
\end{document}
--------------------------------

with:
lilypond-book -V --psfonts test.lytex

results in the file:
----------- test.tex -----------
%% a comment
\documentclass[english]{article}
\begin{document}
{%
\parindent 0pt
address@hidden
\ifx\preLilyPondExample \undefined
  \relax
\else
  \preLilyPondExample
\fi
\def\lilypondbook{}%
\input lily-531319895-systems.tex
\ifx\postLilyPondExample \undefined
  \relax
\else
  \postLilyPondExample
\fi
}
\end{document}
----------------------------------

Note that RequirePackage{graphics} has not been added to the file. It
appears that the initial comment is causing the confusion. When it is
deleted the file is processed correctly. (Front ends such as LyX
generate latex code with an itial comment)

-- 
Bernard Hurley <address@hidden>