Chord is software for creating staffless lead sheets (also known as chord charts) in PostScript format. Chord was developed by Martin Leclerc and Mario Dorion. This project has been inactive for several years. It was forked in 2007 to a project called Chord (pronounced as chord-ee-ee)

Chord or ChordPro is the name of a simple text format for the notation of lyrics with chords. Although primarily intended for guitarists, it can be used for all kinds of musical purposes.

The Chord format is invented by the original authors of the Chord program, Mario Dorion and Martin Leclerc. For unknown reasons the users of the format started to call it ChordPro.

Several tools exist that can process data in ChordPro format: to print nice song sheets, create web pages, or to transform it in into a format suitable for other tools.

A ChordPro data file is a simple text file, which is interpreted line by line. Line endings should obey the rules of the platform. Chordii: Line endings according to the Unix, Linux, Microsoft Windows and OS/X platforms are all handled on all platforms.

ChordPro file processing tools may impose restrictions on the encoding of the data in the file. Some tools may require the data to be in ASCII encoding, other tools may allow a Unicode encoding. Chord version 3.6 and later accepts the full ISO 8859.1 (Latin1) character set. Chordii: Version 4.5 can be build to accept the full ISO 8859.2 character set.