The simple answer is that lilypond-book doesn't support pdflatex at the moment. It shouldn't be too difficult to add such a feature, since lilypond-bin can create output files that pdftex can process, the problem is that the pdftex output format is not very actively supported.
How come? I would think that for publishing Articles including music examples having a searchable PDF output using pdflatex would be the best way to do it. That way no detour using DVI is necessary.
However, it should be possible to search a file produced with dvips+ps2pdf just as well as a file produced by pdflatex.
or dvipdf...
Well, I tried all different versions you suggested, and with none of them I was able to search for any word. The example I sent you in the last mail was searchable, but my main thesis file wasn't. Here are the headers of the file - do you know what could stop Acrobat Reader from searching it?
\documentclass[titlepage,a4paper,12pt,twoside,bibtotoc,liststotoc,idxtotoc]{scrartcl}
% deutsches Dokument \usepackage[german]{babel}
% deutsche Besonderheiten \usepackage{german}
% Umlaute verarbeiten \usepackage[latin1]{inputenc} \usepackage[T1]{fontenc}
% wie ist das Layout der Seiten \pagestyle{headings}
% A4-Seite besser ausnutzen \usepackage{a4wide}
% um underfull vboxes zu vermeiden \raggedbottom
% 1 1/2-zeilig %\renewcommand{\baselinestretch}{1.5}
% für die Verlinkungen im Dokument % 1) für's Web \usepackage[bookmarksnumbered,colorlinks,linkcolor=blue,anchorcolor=red,citecolor=blue,filecolor=magenta,menucolor=blue,pagecolor=blue,urlcolor=magenta]{hyperref} % 2) für's print-out %\usepackage[bookmarksnumbered,colorlinks,linkcolor=black,anchorcolor=black,citecolor=black,filecolor=black,menucolor=black,pagecolor=black,urlcolor=black]{hyperref}
% PDF-Informationen
\hypersetup{pdftitle={Konzeption und Implementation eines computergestützten Systems zur Melodiesuche},
pdfauthor={Christian Datzko}}
% für einheitliche Schriftart im Koma-Paket \renewcommand{\sectfont}{\rmfamily\bf}
% für Bilder und Zeichnungen \usepackage[dvips]{graphicx} \graphicspath{{Abbildungen/}}
% für wörtliches Einfügen von Dateien (z.B. .java-Dateien) \usepackage{moreverb}
% für bibtex-Bibliographien \usepackage{natbib} \bibliographystyle{Bibliography/bibliography}
% für Mengensymbole \usepackage{amssymb} % für bessere Mathematik \usepackage{amsmath} % für Sätze, Theoreme und so \usepackage{amsthm} \theoremstyle{definition} \newtheorem{theorem}{Theorem}[section] \newtheorem{lemma}[theorem]{Lemma} \newtheorem{proposition}[theorem]{Proposition} \newtheorem{korollar}[theorem]{Korollar} \newtheorem{satz}[theorem]{Satz} \newtheorem{definition}[theorem]{Definition} \def\proofname{Beweis}
\newenvironment{beispiel}[1][Beispiel]{\begin{trivlist} \item[\hskip \labelsep {\bfseries #1}]}{\end{trivlist}} \newenvironment{anmerkung}[1][Anmerkung]{\begin{trivlist} \item[\hskip \labelsep {\bfseries #1}]}{\end{trivlist}}
\begin{document}
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