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A chord progression is an ordered sequence of chords played in time, and it works as the harmonic backbone of a song: it sets the emotional color, creates tension and release, and gives melody and lyrics something to sit on. You can build one by picking a key, choosing chords from that key's scale, arranging them by harmonic function (tonic, subdominant, dominant), and testing the loop by ear. This applies to most Western popular and classical styles; if you're writing modal, chromatic, or non-Western music, the same building blocks apply but the "rules" loosen considerably.

Why progressions matter more than individual chords

A single chord is just a stack of notes. A progression is what makes those notes feel like motion — a journey from a place of rest, through tension, and back to rest. That sense of movement is why the same four chords can support a love ballad, a punk song, or a hymn depending on rhythm, voicing, and melody.

Two things do most of the work:

• Order — the same chords in a different sequence create a different emotional arc.
• Duration and rhythm — how long each chord lasts and where it lands relative to the beat changes how strongly it pulls toward the next one.

How Roman numerals describe progressions

The most useful way to talk about progressions is Roman numeral analysis, because it describes the function of each chord independently of the key you're in.

In a major key, you build chords by stacking notes from the scale. The seven resulting chords are:

The classic example I–V–vi–IV (in C major: C–G–Am–F) is the "four chord song" behind countless pop hits. Because it's written in numerals, you can play it in any key: in G major it becomes G–D–Em–C.

The three functions

Progressions feel logical because chords cluster into three jobs:

• Tonic (I, vi, iii) — home, stability, resolution.
• Subdominant (IV, ii) — movement away from home, a gentle lift.
• Dominant (V, vii°) — tension that wants to resolve back to tonic.

A huge share of songs follow a tonic → subdominant → dominant → tonic shape, even when the specific chords vary. Once you hear chords as functions rather than names, you can substitute freely — swap a IV for a ii, or a I for a vi — and keep the progression coherent.

A practical method for building a progression

1. Pick a key. Choose the key that fits your vocal range or instrument. This fixes which seven chords are "in bounds."
2. Choose the scale. Major for bright, uplifting material; natural minor for darker, sadder material. (Minor keys use the same numeral logic with different chord qualities.)
3. Select chords by function. Start with a tonic chord, add a subdominant, then a dominant, then return home. For example: I – IV – V – I.
4. Arrange and vary. Reorder, repeat, or substitute chords to taste. Try starting on vi instead of I for a moodier opening.
5. Test the loop. Play it through several times. Listen for where it feels like it wants to go next — that instinct is your ear tracking harmonic function.
6. Adjust rhythm and length. Try two beats per chord, then four. Change where the loop restarts. Small timing changes often fix a progression that feels "off."

Common progressions worth knowing

• I–V–vi–IV — the pop staple; versatile and singable.
• ii–V–I — the core of jazz cadences; strong, sophisticated resolution.
• I–vi–IV–V — the "doo-wop" progression; nostalgic and circular.
• vi–IV–I–V — the same chords as the pop staple but starting on the minor, giving a sadder feel.
• I–IV–V–IV — simple, driving, common in rock and folk.

Where tools help

You don't have to work all of this out by hand. A chord progression generator or sketch pad lets you audition ideas quickly, hear them back, and iterate before committing. Chordico, for instance, describes itself as "a sketch pad for writing chord progressions" where you can "save, share, and download MIDI chords for free" — the MIDI export is the useful part, because it drops your idea straight into a DAW to keep building. Note that the app requires JavaScript enabled in your browser to run.

Tools like this are best used for experimentation and speed, not as a replacement for understanding function. If you know why V pulls to I, you can judge whether a generated progression actually works for your song instead of accepting whatever comes out.

The short version

A chord progression is an ordered set of chords that forms a song's harmonic backbone. Learn to read it in Roman numerals, think in terms of tonic–subdominant–dominant function, and build by picking a key, choosing chords from the scale, arranging them by function, and testing the loop. Generators and sketch pads speed up the trial-and-error, and MIDI export carries your idea into the next stage of production.

ChordPro is a plain-text file format for writing lyrics with chords, plus a reference implementation that turns those files into formatted lead sheets and songbooks. You write songs in any text editor using simple bracket notation, then render them to PDF or another output. It suits guitarists and other musicians who want clean, printable chord charts without a full notation program. The format and the reference implementation are free products, though the project asks for donations to cover hosting costs.

What a ChordPro File Is

A ChordPro file is a text file — the site notes that "any text editor can be used to create and maintain them." The format was developed in 1992 by Martin Leclerc and Mario Dorion, who built a tool called chord to process files they called chord files. Users and tools later adopted the name "chordpro" for the files, and that name stuck.

The core idea: lyrics are typed as normal text, and chords are placed inline where they should appear above the words. Because it is plain text, files are portable, diff-friendly, and readable without special software.

Basic Syntax

Chords in brackets

Put a chord in square brackets immediately before the syllable it belongs to:

[C]This is the [G]way we [Am]write a [F]song

When rendered, each chord sits above the point in the lyric where it was placed. This is the single most important rule to learn.

Directive lines

Lines that start with a curly brace are directives — instructions to the renderer rather than content to display. Typical uses include song metadata and formatting control. For example, a title directive marks the song title, and comment directives add notes that are not part of the lyric line.

The exact set of directives is large; the reference implementation's documentation is the authoritative list, and the site describes the format as "simple by nature" while the reference implementation itself "has very powerful features."

Rendering to Lead Sheets and Songbooks

The workflow is: write or edit the text file, then run it through a ChordPro processor to produce output. The official site highlights "powerful PDF creation" and the ability to "turn your ChordPro formatted songs into beautiful looking songbooks."

A practical sequence:

1. Create the song as a plain-text file with a .cho, .crd, or .chordpro-style extension (the site lists chopro, cho, and crd among its keywords).
2. Add chord brackets and any directives you need.
3. Process the file with the reference implementation or another compatible tool.
4. Check the rendered output — chord placement above lyrics is the thing most likely to need adjustment.
5. For a songbook, combine multiple song files and render them together.

The site does not publish a step-by-step command reference in the material available here, so consult the reference implementation's own documentation for exact invocation and options.

Beyond Basic Chords

ChordPro is not limited to simple C-F-G charts on a standard-tuned six-string guitar. The site lists several extended capabilities:

Although the format was "initially intended for guitarists," the site states it "can be used for all kinds of musical purposes," and it "became a popular way to write lead sheets" with many tools adopting the format.

Where to Get It and Who Maintains It

Since 2015, a small team of volunteer users has maintained the ChordPro standard, taking over from Leclerc and Dorion. That team developed a new reference implementation with added features and "an easy to use graphical application."

Everything is Open Source, and the project welcomes contributions via GitHub. The standard and reference implementation are free products — the site describes them as "free as in speech" — but it also notes that websites, storage, and bandwidth cost money and invites donations through PayPal or a "buy a coffee" option.

When to Use ChordPro

Choose it if you want:

• Chord-and-lyric lead sheets you can write in any text editor
• A format many existing tools already read
• PDF output and multi-song songbooks from the same source files
• Extras like alternate tunings, note-naming systems, and embedded score fragments

It is less suited to full standard notation or audio production — for those, use a dedicated notation or DAW tool. For text-based chord charts that print cleanly, ChordPro is a well-established, widely supported choice.