ChordPro magic directive ({+})

ChordPro is a long-standing, open-source file format and software used for typesetting lead sheets, specifically lyrics with chord notations. The 'ChordPro magic directive' refers to the {+ ...} syntax used within a song file to adjust configuration settings dynamically at runtime. This specific feature allows users to modify parameters like diagram visibility or formatting on the fly without altering the global configuration file.

The project is a community-driven open-source initiative. It was originally created in the early 1990s as 'Chord' by Martin Leclerc and Mario Dorion before being modernized and maintained by the current community of developers. As an open-source tool, it is not produced in a specific country but is developed by contributors globally, with the lead developer currently based in the Netherlands.