Prebuilt Documentation and packages are available from:

    http://lilypond.org

LilyPond development is hosted at:

    http://savannah.gnu.org/projects/lilypond

Here is a simple explanation of the directory layout for LilyPond's
source files.

   .                    Toplevel READMEs, ChangeLog, build bootstrapping,
                          patches for third party programs
   Documentation/
       bibliography/    .bib files with references to books and articles
       misc/            Old announcements, ChangeLogs and NEWS
       pictures/        The logo
       topdocs/         Sources for the toplevel READMEs
                          (README.txt, INSTALL.txt, NEWS.txt etc.)
       user/            User manuals
       po/              Translated manual node names
       fr/ es/ de/      Docs translated to French, Spanish, German, resp.
   elisp/               Emacs LilyPond mode and syntax coloring
   flower/              A simple C++ library
   input/               Music input examples
       lsr/             Snippets from the LilyPond Snippet Repository
                          (auto-generated, do not modify!)
       manual/          Examples from the manual
       mutopia/         Real music, more at www.mutopiaproject.org
       new/             Snippets which are too new for LSR
       regression/      Testing of features, one test per file
       texidocs/        Translations of texidoc and doctitle fields
                          (for input/lsr)
       tutorial/        Examples from the tutorial 
   lily/                C++ sources for the LilyPond binary
   ly/                  System music include files
   make/                Specific make subroutines and packaging for
                          Red Hat-like distributions (.spec files)
   mf/                  MetaFont sources for the Emmentaler and Aybabtu fonts
   po/                  Translations for binaries and end-user scripts
   ps/                  PostScript library files
   python/              Python modules, MIDI module
       auxiliar/        Python modules used by maintenance scripts
                          or in the build process
   scm/                 Scheme sources for LilyPond and subroutine files
   scripts/             End-user scripts
       auxiliar/        Scripts for maintaining the sources and scripts
                          for the build process that need not be built
       build/           Scripts for the build process that must be built
   stepmake/            Generic make subroutine files
   tex/                 TeX and texinfo library files
   vim/                 Vi(M) LilyPond mode and syntax coloring