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The problem it solves
You need a clear, complete harmonic structure that gives a phrase direction: one that leaves the rest, builds tension and returns to it with a solid ending.
Detailed theory
Key idea
It is the complete functional cycle: tonic → subdominant → dominant → tonic (T–S–D–T).
It ends with the authentic cadence (V → I), the strongest closure in tonal harmony.
Understand it
The progression uses the three chords that hold up a key: the first degree (I, the tonic), the fourth (IV, the subdominant) and the fifth (V, the dominant). In C major they are, respectively, C major, F major and G major.
The path explains the three tonal functions step by step. I is the rest, the centre. IV moves away a little and opens the phrase (departure). V builds tension and demands resolution (it is the dominant). And the final I resolves it: it comes home. In Roman numerals: I → IV → V → I; in C major: C → F → G → C.
The closing V → I is exactly an authentic cadence, which is why the progression feels so complete and conclusive. It is the skeleton of countless songs and tonal pieces, from the simplest hymn to the blues.
Because it is defined by degrees and not by specific notes, the same progression works in any key: you only have to choose the tonic and build I, IV and V on the scale. In G major it would be G – C – D – G.
An analogy: it is like a round trip. You leave home (I), move away a little (IV), reach the point of greatest tension on the journey (V) and come back home with the sense of having completed the circle (I).
Tension curve
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The tension curve of I–IV–V–I: the tonic rests, the subdominant opens, the dominant builds tension and the final tonic resolves it.
How to recognise it
How it's written
It is written with Roman numerals in uppercase because all three are major chords: I – IV – V – I. Below you can write the function: tonic, subdominant, dominant, tonic.
How it feels
Follow the path: the first chord rests, the second opens, the third tenses and the fourth returns to rest. The sense of "home → away → tension → home" is the signature of this progression.
Common mistake
Seeing the four chords as a list of names instead of a cycle of functions (rest, departure, tension, resolution).
Thinking the progression only exists in C major: it is defined by degrees (I–IV–V–I) and can be transposed to any key.
Try it
Play C – F – G – C and notice the path of rest, opening, tension and return.
Transpose the same progression to G major (G – C – D – G) and check that the functional feeling is identical.
On the instrument
Chord progression
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The I–IV–V–I progression in C major: C (I, tonic) – F (IV, subdominant) – G (V, dominant) – C (I, tonic). The complete functional cycle T–S–D–T.
Where it's used
- Accompanying a song
- Giving a melody a complete harmonic base with direction.
- Understanding the tonal functions
- Seeing the cycle T–S–D–T (tonic, subdominant, dominant, tonic) in its clearest form.
- Transposing to any key
- Applying the degrees I–IV–V–I from any tonic to repeat the same progression.
Examples
Chord progression
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The same progression transposed to G major: G (I) – C (IV) – D (V) – G (I). It is defined by degrees, so it works in any key.
Exercises
Recognise the I–IV–V–I progression
Listen and identify the I–IV–V–I progression among other options.
Complete 6 attempts · 70% accuracy to pass
Mini test
Check that you've got it.
0/9 answeredQuestion 1/9
Which tonal functions does the I–IV–V–I progression travel through?