How chord progressions work

Start with harmonic function

In tonal music, chords often fall into three broad jobs. Tonic chords feel settled, predominant chords move away from tonic, and dominant chords create pressure to return.

Tonic: the point of rest

I is the clearest tonic chord because it is built on the key centre. vi and sometimes iii can prolong or substitute for tonic without sounding fully final. Beginning or ending on I makes the key especially clear.

Predominant: moving away

ii and IV commonly lead toward the dominant. They introduce notes that shift the harmony away from rest without creating the strongest tension themselves. In C major, Dm and F both prepare G or G7.

Dominant: tension and return

V has a strong pull toward I because scale degree 7—the leading tone—sits one semitone below the tonic. Adding the seventh strengthens the resolution: in G7, B tends to rise to C while F tends to fall to E.

Common progressions

I–V–vi–IV cycles through familiar functions without fully closing after every chord. ii–V–I creates a more direct preparation, tension and release. I–vi–IV–V postpones the return until its final dominant. The numerals reveal the shared architecture when these patterns are transposed.

Voice leading matters too

Function explains the large-scale direction, but smooth note movement helps the progression connect. Hold common tones and move other voices by the smallest useful interval. The same Roman numerals can feel dramatically different depending on inversions, rhythm, register and voicing.

Writing a progression

1. Choose a key and a tonic chord.
2. Decide whether you want a strong resolution or a repeating loop.
3. Use ii or IV to approach V when you want clear forward motion.
4. Try inversions to reduce jumps between voices.
5. Change rhythm and voicing before adding more chords.