LilyPond development is hosted at savannah.gnu.org/projects/lilypond Here is an attempt at a simple explanation of the directory layout for LilyPond's source files. Documentation/ bibliography/ .bib files with references to books and articles windows/ building on windows pictures/ .xpms of the logo programmer/ programmers documentation, including a test document topdocs/ sources for the toplevel files (README.txt, INSTALL.txt, etc.) user/ User manuals buildscripts/ Scripts used during the build process debian/ Files for building .deb packages flower/ A generic library include/ input/ Various input files test/ Test features: one file per feature bugs/ Show bugs no-notation/ Examples or bugs that do not produce output regression/ Various features for regression test tutorial/ Examples from the tutorial lily/ Source code for LilyPond include/ ly/ Standard include files. make/ LilyPond specific Make subroutine files mf/ MetaFont sources for the feta font midi2ly/ midi2ly source code include/ mutopia/ Larger examples with full music pieces. E.Satie/ F.Schubert/ J.S.Bach/ intl/ library for gettext po/ translations ports/ access to mutopia archive ps/ postscript library files tex/ TeX library files scm/ Scheme initialisation and subroutine files scripts/ User scripts stepmake/ Generic make subroutine files