We recommend knowing first
The problem it solves
You want a simple chord sequence that sounds good right away, that you can repeat under a melody as many times as you like, and that works in any key.
Detailed theory
Key idea
I-V-vi-IV mixes the four basic functions: tonic (I), dominant (V), submediant (vi) and subdominant (IV).
The V→vi move is a deceptive cadence: instead of closing on the tonic, it turns to vi and keeps the loop open.
Understand it
The I-V-vi-IV progression is the well-known "four-chord" progression of pop, found in countless songs. In C major it is C major (I), G major (V), A minor (vi) and F major (IV), and they chain over and over forming a circle.
What makes it special is that it gathers all four harmonic functions of the key. The I is the tonic, the centre of rest. The V is the dominant, which creates tension and usually asks to return to the tonic. The vi is the submediant, a minor chord that acts as a tonic substitute (it shares two of its three notes with the I). The IV is the subdominant, which prepares and pushes forward.
The key move is the step from V to vi. After the dominant we would expect the return to the I (the authentic cadence V→I); instead, the progression goes to vi. This turn is a deceptive cadence: it resolves the tension of the dominant, but onto a chord that is not the expected tonic, so the phrase does not fully close and invites you to carry on. That is why the loop can repeat without stopping.
An analogy: picture a circular path that runs through the four "neighbourhoods" of the key —rest (I), tension (V), an unexpected refuge (vi) and momentum (IV)— and returns to the start. You can walk round and round without ever reaching a closed door; each lap leaves you right where you can set off again.
Because the progression is defined by degrees (I-V-vi-IV) and not by actual notes, it is fully transposable. In G major it is G-D-Em-C; in F major, F-C-Dm-Bb. The same journey of functions sounds just as natural in any key.
Chord progression
Loading audio…
The key turn: V → vi. After the dominant (G) we would expect to return to the I (C), but the progression goes to vi (Am). It is a deceptive cadence that keeps the loop open.
How to recognise it
How it's written
It is written in roman numerals: I - V - vi - IV. The uppercase ones (I, V, IV) are major chords and the lowercase one (vi) is the minor chord. The order shows the sequence; on reaching IV, the loop returns to I.
How it feels
Listen to how the third chord (vi) arrives after the dominant but does not sound like an ending: it is a "fake" rest that keeps the wheel turning. When the I comes back you will notice the phrase has never fully closed.
Common mistake
Expecting the dominant (V) to always resolve to the I: here it goes to vi (deceptive cadence), and that is exactly what keeps the loop open.
Memorising only the chords of one key (C-G-Am-F) and not the degrees (I-V-vi-IV); thinking in degrees lets you transpose the progression to any key.
Try it
Play the cycle C - G - Am - F several times in a row and notice it never sounds like a definite ending.
Transpose it to G major (G - D - Em - C) and check that the same journey of functions sounds just as natural in another key.
On the instrument
Chord progression
Loading audio…
The I-V-vi-IV progression in C major: C (I) - G (V) - Am (vi) - F (IV). Listen to how the loop turns and returns to the start without ever fully closing.
Where it's used
- Writing a pop song
- Using the I-V-vi-IV loop as a verse or chorus bed to write a melody over.
- Accompanying in any key
- Thinking of the progression in degrees (I-V-vi-IV) to transpose it instantly to G, F or whatever key you need.
- Understanding the deceptive cadence
- Recognising the V→vi turn as the tool that avoids closing and keeps the cycle open to repeat.
Examples
Chord progression
Loading audio…
The same loop transposed to G major: G (I) - D (V) - Em (vi) - C (IV). The degrees are identical; only the key changes.
Exercises
Recognise the I–V–vi–IV progression
Listen and identify the popular I–V–vi–IV progression among other options.
Complete 6 attempts · 70% accuracy to pass
Mini test
Check that you've got it.
0/10 answeredQuestion 1/10
Which degrees make up the four-chord pop progression?