\documentclass{article}

\usepackage{lilypondbook}
\begin{document}
\section*{LilyPond code, compilable through ordinary \LaTeX}

This is a normal paragraph which is followed by a music example.
If I compile the document with \LaTeX, I get:

\begin{lilypond}
music = \relative e'' {
  e16 gis fis e dis cis | %1
  h4 r8 | %2
  e16 gis fis e dis cis | %3
  h4 r8 | %4
}
\end{lilypond}
To get the music example I have to process this via \texttt{lilypond-book}.
\end{document}