This is an unofficial resource on extending LilyPond in Scheme.
You will find:
A Scheme tutorial, for learning the language itself, with an eye on using it in LilyPond.
A complete guide to extending. It assumes Scheme knowledge (which can be acquired through the tutorial or other resources), and aims at covering how LilyPond works internally and how to extend these inner workings to suit your needs.
Questions about Scheme and LilyPond are welcome on the lilypond-user mailing list. If you find any inaccuracies in this document, you want to suggest an improvement, or you would like to help with translating it into other languages, please read Appendix: About this document.
This document is free to reuse. It is placed under the Creative Commons CC0 license.