about: Add entry on songbooks website.

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diff --git a/about.md b/about.md
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@@ -21,6 +21,16 @@ Below you can find some interesting projects of mine.
 Tiny page to generate printable folded booklets of PDF files directly in the
 browser (page in portuguese).
 
+### [Songbooks](https://songbooks.euandreh.xyz)
+
+Website to manage, transpose and distribute LilyPond songs and bundle them with
+LaTeX sources into songbooks. There's a demo deployment at
+[songbooks-demo.euandreh.xyz][1] and a production deployment with a religious
+repertoire at [hinarioespirita.org][2].
+
+[1]: https://songbooks-demo.euandreh.xyz
+[2]: https://hinarioespirita.org
+
 ## Other things
 
 [Pastebins listing](./pastebins.html).