Attached is a proposed, cleaner directory tree for LilyPond, wherein:

• Above each set of sibling {natural language} directories, a new directory, 'lang/' is added to contain them;
• All necessary source files not under our direct control (i.e., occasionally imported from other repositories) fall under top-level directory, 'vendor/';
• All (relatively seldomly) regenerated files, which (for whatever reason) we must keep and maintain in the repository sources, fall under top-level directory, 'generated/';
• Child files of {natural language} directories are segregated, at their great-grandparent level, based on their filename extension;
• English is parallel to other languages;
• Files bearing differing filename extensions are separated, cleanly;
• For each set of sibling files, new directories are added, each to contain only those files bearing each filename extension;
• 'lang/' and {natural language} directories now fall under filename extension directories;
• Manuals fall under directory, 'manual/';
• {natural language} directories are separated more cleanly from directories with other purposes;
• The filename extension is the most important organizational consideration, after the primary grouping of files by purpose;
• The name of the overall documentation directory (in the repository) is simplified to, 'doc/';
• The use of symlinks in the build process is greatly reduced;