ChordPro is a reference implementation for the ChordPro file format, a plain-text notation for lyrics with chords. This Perl application parses `.cho`/`.chordpro` files and produces professional-quality sheet music in PDF, HTML, LaTeX, Markdown, and plain-text outputs. It includes a command-line interface (CLI) and a cross-platform graphical application built with WxPerl. The architecture features a modular output backend system, a pluggable delegate framework for embedded music notation (ABC, LilyPond, SVG), a comprehensive configuration system using Relaxed JSON, and a custom SVG-to-PDF engine. It also provides chord parsing, transposition, diagram generation, and support for multiple note naming systems (common, Nashville, Roman, solfège). The repository bundles extensive test suites, documentation, and packaging scripts for Windows, macOS, and Linux. While the codebase demonstrates strong engineering with several reusable components, it carries some legacy dependencies and hardcoded paths from its wxGlade-generated GUI.