strange output with lilypond book

[Stefan Thomas]

Dear community,
when I compile the following file with latex and lilypondbook, it looks quite strange.
There's is a break after every bar of the lilypond example.
I think it has to do with the input-command.
Here is the code of the latex-file:
> \documentclass[a4paper,12pt]{article}
> \usepackage[ngerman]{babel}
> \usepackage[utf8]{inputenc} 
> \usepackage[paper=a4paper,left=20mm,right=20mm,top=25mm,bottom=25mm]{geometry}
> \input{./semester.tex} 
> \author{Myself}
> \title{Examination \Semester }
> \date{ \Datummontag } 
> \begin{document}
> \maketitle
> \begin{flushright}
> Name, Vorname: 
> \end{flushright}
> \textbf{First exercise:}
> \begin{lilypond}
>  \relative { c d e f g2 e  g 4 f e d e2 c }
> \end{lilypond}
> \end{document}

And this is the code of the file semester.tex

> \newcommand{\Semester}{Wintersemester 2012/2013}
> \newcommand{\Datummontag}{31.1.2012}


For compilation I use the following code:
> #!/bin/bash
> TEMP_DIR=temp
> CURRENT_DIR=$(pwd)
> lilypond-book --pdf \
>               --include="$CURRENT_DIR"\
>               --include=/home/stefan/partituren/lilyponds/vorlagen/\
>               --output="$TEMP_DIR" \
>               "$1".tex && \
> (cd "$TEMP_DIR" && \
>  pdflatex "$1".tex && \
>  mv "$1".pdf ..) && \
> rm -rf "$TEMP_DIR"