Song · Chords
Man of Constant Sorrow banjo
Almost everyone knows this one — the mournful bluegrass standard the film O Brother, Where Art Thou? put back on the map. It is a vocal-led song the banjo backs with rolls, built from three simple chords in a plain I–IV–V. Here are the chords, how the progression moves, and how to practise backing a singer with it.
The song that O Brother made famous
Man of Constant Sorrow is a traditional folk song that dates to the early 1900s, associated with the blind Kentucky fiddler Dick Burnett, and it has long been in the public domain. The Stanley Brothers turned it into a bluegrass standard, and it exploded in popularity all over again when it anchored the soundtrack to the film O Brother, Where Art Thou?. Unlike a fiddle tune such as Cripple Creek, this is a vocal-led song — the singer carries the melody and the banjo backs it with rolls. That makes it a perfect early song for learning to play behind someone rather than out front.
The three chords you need
In G, Man of Constant Sorrow is built from just three chords: G, C and D7. Here they are in open G — the numbers are frets, 0 means play the string open, and the top line is your 1st string:
The progression itself is simple and repeats through the verse. It leans on G, moves out to C, and touches D7 at the turnaround before falling back home:
How the chords move
This is a textbook I–IV–V progression — the backbone of countless bluegrass and folk songs. In G, the I is G (home), the IV is C, and the V is D or D7. You spend most of the verse resting on G, step out to C to lift the phrase, and use D7 at the turnaround to pull the ear back home to G. Because the banjo is backing a singer here rather than playing the tune, your job is to keep a steady roll going under those changes and land each new chord right where the words turn. Learn the shape of that progression and you can follow the song in any key a singer takes it.
Bands often take Man of Constant Sorrow in A instead of G to suit the singer's voice — the famous O Brother version sits higher than open G. The good news: the I–IV–V shape of the progression never changes, so once you know it in G you understand it everywhere. Our guide to how to play the banjo covers using a capo to shift a song like this up to match a vocalist.
How to learn it
How you practise matters more than how long. These four steps are the difference between knowing the chords and actually being able to back the song at a jam.
Before you play a note of the song, get G, C and D7 clean on their own. Change between them slowly until each one rings clearly with no buzzes. G is easy — every string open — so most of your work is the move to C and D7 and back. Two minutes of clean changes beats ten minutes of fumbling the whole song.
This is a vocal-led song — the banjo backs the singer, it does not carry the tune. So memorise the order the chords move in: G, then C, then back to G, then a D7 at the turnaround. Once the shape of the progression is in your hands, you can play it behind anyone singing.
Put a plain forward roll (thumb–index–middle) under each chord and let it run without stopping as you change shapes. The roll is what makes it sound like bluegrass rather than strummed chords. Play it slow enough with a metronome that the roll never stutters when a chord changes.
The real skill here is following a voice. Play along with someone singing, or with a recording, and focus on landing your chord changes exactly when the words turn. Backing a singer cleanly is the whole point of the song — and a skill that carries into every jam you ever sit in.
Two things smooth the whole process. A set of finger & thumb picks give you the clean, bright tone the rolls behind a singer are built for, and a clip-on tuner on the headstock means every run at the song starts in tune — doubly important when you may need to capo up to match a vocalist.
Getting a full arrangement
This page gives you the chords, the progression and how to back the song — everything you need to start playing Man of Constant Sorrow behind a singer inside a roll. For a written, note-for-note banjo arrangement to read alongside it, a good banjo tab & chord book is the most reliable source — and the chords you have learned here will make that arrangement far quicker to follow.