Songwriting
Song structure: the parts and how they fit together
A song is built from a handful of section types — intro, verse, pre-chorus, chorus, bridge, outro — and structure is the order you put them in. Most modern songs use one of three or four arrangements, and knowing them is less about following a template than about knowing what the listener already expects at each moment.
This page is part of the guide to songwriting.
The parts, and what each one does
Intro. Sets tempo, key and mood, usually four or eight bars. In streaming-era pop it is often skipped entirely.
Verse. Advances the story with new words each time. Same music, different lyric.
Pre-chorus. Optional. Two to four bars that build tension into the chorus, often by leaving the tonic.
Chorus. The destination. Same words every time, usually containing the title, and melodically higher than the verse.
Bridge. Appears once, after the second chorus, and breaks the pattern before the last one.
Outro. Ends the song — a repeated chorus, a fade, or a short instrumental tag.
Three arrangements that cover most songs
Verse–chorus. Intro, verse, chorus, verse, chorus, bridge, chorus. The default in pop and rock since the 1960s. Around three to four minutes at ordinary tempos.
Verse–chorus with pre-chorus. The same, with two to four bars inserted before each chorus. Adds lift where the jump from verse to chorus feels abrupt.
AABA. Four eight-bar sections: the main strain twice, a contrasting bridge, the strain again. Standard before the 1960s and still the norm in jazz — the form is covered in more detail on the musical form page.
Twelve-bar blues. No chorus and no bridge: a twelve-bar harmonic cycle repeated, with interest coming from the lyric and performance.
A worked example
A typical three-and-a-half-minute pop song: 4-bar intro, 16-bar verse, 8-bar pre-chorus, 16-bar chorus, 16-bar verse, 8-bar pre-chorus, 16-bar chorus, 8-bar bridge, 16-bar chorus, 8-bar outro.
At 120 beats per minute in four-four, each bar is two seconds, so that arrangement runs about three minutes and forty seconds — which is why so many songs land near that length.
Cut the intro to nothing and drop one pre-chorus and you have the modern streaming shape: chorus within thirty seconds, total length under three minutes.
How to decide your own
Start from the chorus and count backwards. If the chorus is strong, get there sooner; if it needs setup, that is what a pre-chorus is for.
Ask what the bridge is for before writing one. «The template has one» is not a reason; «the last chorus needs to land harder» is.
Check the proportions rather than the labels. A verse twice as long as the chorus will feel slow no matter what the sections are called, and the fix is cutting words rather than rearranging blocks.
Then write your draft out as letters — A B A B C B. Seeing the shape takes ten seconds and shows immediately whether anything repeats too often.
When to break the pattern
Deliberately, and once. A song with two bridges, a false ending and a key change has spent its surprises; one departure in an otherwise expected shape is what listeners actually notice.
The safest place to be unusual is the end. Dropping the final chorus to voice and one instrument, or ending on the bridge instead of a chorus, changes the impression without confusing anyone about where they are.
And remember that structure is a service to attention, not a rule. If the song holds for three minutes without a bridge, it does not need one.
Where to go next
Structure sets the order of sections; what each one sounds like is the arrangement. The section that provides contrast is the bridge, and the one everything else exists to reach is the chorus.
Common questions
What are the parts of a song?
Intro, verse, pre-chorus, chorus, bridge and outro. The verse advances the story, the chorus repeats unchanged and holds the title, the pre-chorus builds into it, and the bridge appears once to break the pattern.
What is the most common song structure?
Intro, verse, chorus, verse, chorus, bridge, chorus — often written A B A B C B. Adding a pre-chorus before each chorus is the most frequent variation, and both run around three to four minutes at ordinary tempos.
How long should each section be?
Verses and choruses are usually 8 or 16 bars, pre-choruses and bridges 4 or 8. At 120 bpm in four-four a bar is two seconds, so a 16-bar chorus takes about half a minute.
Does every song need a bridge?
No. Blues forms, many folk songs and plenty of dance tracks work without one. Write a bridge when the final chorus needs to land harder or the lyric has one more thing to say — not because the template has a slot.
What is the difference between a verse-chorus song and AABA?
In verse-chorus the chorus is the destination and the verse changes words each time. In AABA a single repeated strain is the tune and the contrasting section appears once in the middle — the form that dominated songwriting before the 1960s.
How do I know if my structure is working?
Write the draft out as letters and look at what repeats. If a section appears four times, it has to be strong enough for that; if a verse runs twice as long as the chorus, the song will feel slow whatever the labels say.
Lay the sections out and count the bars
Put the arrangement in the studio and check when the chorus arrives. Whether a song reaches its destination in time is a matter of seconds, and it is measurable.