Song Structure for Beginners: Verse, Chorus, Bridge, AABA and the 12-Bar Blues, and How to Write Your First Song

Sing "Hot Cross Buns" and you have already heard a song form. The first line comes back as the second line, something new happens in the third, and the fourth line brings the opening back to finish. Musicians would write that a a b a, and the same letters, scaled up, describe hit songs. This guide shows you the blocks songs are built from, the three big ways of arranging them, and where the 12-bar blues fits. Then you will write a 16-bar song of your own at the piano, one step at a time, with a free worksheet for every step.

Songs are built from blocks

The smallest block you can hear is the phrase. In pop and rock songs a phrase typically lasts four bars and carries one line of lyrics, and two to four phrases make a section of usually 8 to 24 bars, according to Open Music Theory, a free, openly licensed music theory textbook. A verse, a chorus and a bridge are all sections.

To describe how sections follow each other, musicians use letters. Our Musical form handout gives the rule in three lines: same music gets the same letter, music that comes back changed a little gets a prime (A′), and new music gets the next letter. Label the form adds one more rule: small letters label the phrases inside a tune, capitals label the sections of a whole piece.

Hot Cross Buns is a a b a: bars 1, 2 and 4 are the same three notes, E, D and C, and bar 3 is new. The letters follow Musical form (Handout 233).

Play it and listen for the return in bar 4: it is the moment the tune sounds finished. That shape, two statements, something different, and the statement again, is the AABA form you will meet below in four bars instead of thirty-two. To practice the letters, Label the form gives you Hot Cross Buns, Mary Had a Little Lamb and Twinkle, Twinkle to label, then four piano pieces.

The sections of a song

Here are the sections you will hear named most often, with the job each one does. The definitions follow Open Music Theory's chapter on pop and rock form.

• Intro: usually short and instrumental, it gets the song going, often with music from a section to come.
• Verse: new words each time it comes back. The verse tells the story and usually starts the song.
• Prechorus: a short section between verse and chorus that builds energy. Chords often change faster and move away from the home chord.
• Chorus: the same words each time, usually including the title, set to the most memorable tune. It typically ends the song.
• Postchorus: a short tag after a chorus that rounds it off.
• Bridge: a contrasting section that holds back the main section, so you wait for its return. Bridges often end on the V chord.
• Outro or coda: the ending. An outro reuses music you have heard (often the chorus, fading out); a coda brings something new.

Six sections, one line each. Few songs use all six: a typical song repeats verse and chorus and adds one or two of the others.

What makes a chorus feel like a chorus? Open Music Theory, quoting Jay Summach's 2012 dissertation, lists heightened intensity: "a more dense or active instrumental texture; prominent background vocals; and/or a higher register melody." Notice the "and/or": a chorus does not have to be higher, it has to stand out. Choruses also most often begin on the home chord.

One more term: a refrain is a repeated line inside a section, not a section of its own. When a verse always ends with the same line, often the title, that last line is a tail refrain.

The word chorus also does three different jobs, so watch the context. In a modern song it is the section with the title that comes back with the same words. In the blues, one whole pass through the 12 bars is called a chorus, as our 12-Bar Blues sheet says. And in old sheet music such as the 1908 song below, CHORUS is printed over the part sung after each verse.

Form 1: strophic (AAA)

In a strophic song one block of music, the strophe, repeats from start to finish, with new words each time. Open Music Theory notes that strophic form is more common in early rock and roll (the 1950s and 1960s) than in the 1970s and beyond. Its example is Carl Perkins's "Blue Suede Shoes": two instrumental strophes, a guitar solo over the same chords and phrases, come between the sung ones. A full strophe is four four-bar phrases that follow a 16-bar blues pattern, and it ends on a tail refrain with the title.

"Blue Suede Shoes" as Open Music Theory maps it: every block has the same underlying music (the first is a shorter version). The two lighter blocks are instrumental strophes, a guitar solo over the same 16 bars.

Many hymns work the same way. In "Amazing Grace" every stanza is sung to the same tune, which is why a hymnal or our Reading a lead sheet handout prints the music only once. Strophic form is the easiest one to write: compose one strong section, then write more verses.

Form 2: AABA, the "32-bar" song

AABA adds contrast. Two strophes (A A) are followed by a bridge (B), and then the strophe returns (A). Summach notes that it is also called the "Tin Pan Alley" or "32-bar" song (Tin Pan Alley was the nickname of New York's popular-song publishing trade in the early 1900s), and Open Music Theory explains that the 32-bar name comes from features of earlier "Golden Age" songs. In Summach's sample of hits, A was 8 bars long in only half of the AABA songs; the rest ran 12 to 16 bars. So treat 32 as a nickname, not a bar count you must hit.

West 28th Street at Broadway in New York, home to many music publishers in the early 1900s, was given the extra name Tin Pan Alley in 2022. York Music Co., which published Take Me Out to the Ball Game, was at 40 West 28th Street. Photo: TFSyndicate, CC BY-SA 4.0, via Wikimedia Commons (cropped).

Open Music Theory's AABA example is the Beatles' "I Want to Hold Your Hand": an intro, two strophes, a bridge, the strophe, then the bridge and the strophe once more. AABA songs almost always play one complete AABA cycle and then either another complete one or a part cycle, usually BA. The strophe begins and ends the song and carries the title line; the bridge builds tension by holding it back. Frank Sinatra's "Strangers in the Night" is AABA too, and Elvis Presley's "Don't Be Cruel" is AABA with strophes built on a 12-bar blues that changes its last line.

"I Want to Hold Your Hand" in Open Music Theory's notation: {AABA}{BA}. The bridge (B) appears twice, and the strophe (A) frames the whole song.

The bridge has a particular job. In an AABA song it should end on the dominant, the V chord, so that the return of A sounds like coming home. Keep that in mind when you write your own bridge later.

Form 3: verse–chorus

In verse–chorus form, the jobs of the AABA strophe are split in two. The verse carries the story and starts the song; the chorus carries the title and the catchiest tune, and ends the song. Open Music Theory says this form rapidly took over rock and roll in the 1960s. Summach's study of the 700 songs on Billboard's yearly Top 20 lists from 1955 to 1989 puts numbers on it: from 1965 to 1969, verse–chorus songs held on average eight of the twenty places each year, and by the late 1980s they had "a near monopoly," with 60% of them using a prechorus. Those figures describe that sample of hits, not today's charts.

Summach uses Mark Dinning's "Teen Angel" (1960) as a typical verse–chorus song. Open Music Theory maps Bon Jovi's "Livin' on a Prayer": an intro, then verse, prechorus and chorus; a short mid-song intro; a second cycle with a postchorus; a third cycle that starts with an instrumental chorus; and an outro made of the chorus. The order inside each cycle is always verse, prechorus, chorus, postchorus, even when some are missing. A bridge, if there is one, usually comes once, before the last chorus, often in place of a verse.

Top: "Livin' on a Prayer," mapped as in Open Music Theory, I {VPC} I {VPCZ} {C i PC} O. Bottom: a common verse–chorus plan with one bridge before the last chorus.

Some songs keep the same chords under verse and chorus and change only the tune; John Covach calls this simple verse–chorus form, and Open Music Theory's example is U2's "With or Without You." That is good news for a first song: you do not need new chords for your chorus.

Songs with a verse and a chorus are much older than rock and roll. In 1908 Jack Norworth and Albert Von Tilzer published "Take Me Out to the Ball Game" (York Music Co., New York), now in the public domain in the United States. A 1908 edition prints a 32-bar verse with two stanzas about a baseball-mad fan, Katie Casey, then a section headed CHORUS, the part crowds still sing at ballparks.

The 1908 cover, stamped by the Library of Congress when the copyright copies arrived on July 30, 1908. The photograph is of the vaudeville singer Sam Williams; the copy transcribed below is a different 1908 printing, with Nora Bayes on its cover. Image: public domain, Library of Congress, via Wikimedia Commons.

Compare the opening eight bars of each section. The verse starts A, A, A, G, F-sharp: repeated notes in a range of just a 4th, the right shape for telling a story. The chorus opens with a leap of an octave from D up to D on the title words, then falls through B, A and F-sharp. The verse ends on A, the 5th note of the key, which sounds unfinished and leads into the chorus; the chorus ends on D, home. In the waltz time of 3/4, the long notes in the chorus give everyone time to sing along. One detail for singers: the 1908 edition prints "Take me out with the crowd," not "to the crowd."

The vocal line of the first eight bars of the verse and of the chorus, transcribed note by note from a 1908 edition (York Music Co.). The verse moves by step and repeats notes; the chorus opens with an octave leap on the title.

Where the 12-bar blues fits

The 12-bar blues is not a song form like AABA but a pattern for one section: three four-bar lines. The first line is all I, the second two bars of IV and two of I, the third one bar of V, one of IV and two of I. In a blues song the second line usually repeats the words and tune of the first over the IV chord, and the third line answers, so Open Music Theory labels the shape a a′ b. Elvis Presley's "Hound Dog" is a straight 12-bar blues. In songs, the 12 bars most often serve as the strophe of a strophic or AABA song, repeated with new words, and blues players call each pass a chorus.

The 12-bar blues in C, left-hand shapes from The 12-Bar Blues (Handout 53). Each line is four bars: a, a′ (in a song, the first sung line again, over F), b.

For songs built on it and the other famous progressions, read our article Common Chord Progressions in Pop, Rock, Blues, Jazz, and Hip-Hop. To improvise over the 12 bars, The Pentatonic & Blues Scales gives you the notes.

Write your first song, part 1: a loop and a verse

Now it is your turn. You will write an 8-bar verse and an 8-bar chorus in C major, in 4/4, at the piano. Work through the six steps in order and play every stage out loud. The example in the figures is an original tune written for this guide; use it as a model, then make your own choices.

The six steps of this guide. Steps 1 to 4 make the verse; steps 5 and 6 add the chorus and the left hand.

Step 1: choose a loop

Pick one of the three loops on Chords & Progressions in C: I–IV–V7–I, I–vi–IV–V7 or I–V7–vi–IV. The example uses I–vi–IV–V7, which is C, A minor, F and G7. Play each chord for four slow counts in the sheet's smooth voicings, where each change moves your fingers a step or less, and loop it until the changes happen without looking. If the roman numerals are new, The chords of a key shows where all seven come from, and The primary chords: I, IV & V and Primary Chord Patterns drill the three primary chords.

The loop in smooth voicings from Chords & Progressions in C (Handout 78): C-E-G, C-E-A, C-F-A, B-F-G. C stays on the bottom for three chords, and G7 is the "classic squeeze."

Step 2: chord tones on the strong beats

In 4/4 the strong beats are 1 and 3. A reliable starting rule: on those beats, sing or play a note that belongs to the chord underneath. Over C that means C, E or G; over A minor, A, C or E; over F, F, A or C; over G7, G, B, D or F. Write one half note on beat 1 and one on beat 3 of each bar, and you have a skeleton that already fits the chords. It is the rule of Choosing chords for a melody, turned around: there, the strong-beat notes choose the chord; here, the chord chooses the notes.

The skeleton of the verse's first four bars: E and G over C, C and E over A minor, F and A over F, B and G over G7. Every note is in its chord.

Now fill the gaps. Turn each first half note into two quarter notes and let the second one step to the next chord tone. A note that walks by step between two chord tones is a passing tone; a note that steps away and straight back is a neighbor tone. Both belong on the weak beats, 2 and 4, and Non-chord tones shows them, labeled P and N, over C, F and G7. The rule has exceptions on purpose: a suspension or an appoggiatura leans on a strong beat for expression, as the same handout explains. For a first song, stick to the rule.

Each bar now reads chord tone, passing tone (P), chord tone: E-F-G over C, C-D-E over A minor, F-G-A over F, and B-A-G over G7.

If you want a palette where almost nothing can clash, try the five notes C, D, E, G and A. Improvising with the Pentatonic uses them over C, A minor, F and G, with a table of which notes to land on for each chord.

Step 3: one motif

A tune sounds planned when it reuses one short idea, the motif. Motif and sequence shows the moves: repeat the motif, move it to start on another note (a sequence), or turn it upside down. In the example the motif is a rhythm and a shape at once: quarter, quarter, half, stepping upward. Bar 2 moves it to start on C, bar 3 moves it to start on F, and bar 4 turns it upside down so it steps downward to G. Hot Cross Buns, by the way, grows from a three-note motif too, E-D-C, and the handout invites you to grow a tune from it.

One rhythm in every bar. The step-step shape starts on E, then C, then F, and in bar 4 it turns upside down: B, A, G.

Improvising with the Pentatonic gives the same advice: pick a rhythm first, then repeat it with new notes. To train your eye for motifs in real music, Find the motif and the sequence has four phrases to label, the last from Für Elise.

Step 4: question and answer

Your first four bars are the question. They should stop on a note of the G chord over G7: a half cadence, which sounds like a comma. The next four bars are the answer. Start them like the question, then change the ending so the melody lands on C over C: an authentic cadence, V7 to I, a full stop. Two phrases like this make a period, the most common eight-bar shape in music, as Phrase and period puts it; Cadences and Tonic & dominant explain why V pulls toward I.

To land on C in bar 8, the example squeezes F and G7 into bar 7, two beats each, so the C chord arrives on the downbeat of bar 8.

The finished verse. Bar 5 repeats bar 1, bar 6 adds a neighbor tone (E-D-E over A minor), and bars 7–8 close with G7 to C.

Write your first song, part 2: a chorus that contrasts

Step 5: make the chorus stand out

Keep the same key and the same four chords; simple verse–chorus songs do exactly that. The example only reorders them, C, G7, A minor and F, the pop loop from Chords & Progressions in C, and ends with the same F and G7 squeeze into C. Then make the chorus stand out. Summach's list ends with a higher melody, the easiest change to make at the piano; the other three changes below are our own advice for a piano song, building on the patterns above:

• Sing higher. The verse lives between middle C and the B above it; the chorus moves between the A above middle C and the F on the top line of the treble staff.
• Change the rhythm. The verse moves mostly in quarter notes; the chorus moves only in half and whole notes.
• Start on the home chord, and put your title words on beat 1 of the first bar, the strongest beat in the section.
• End V7 to I on the home note, so the chorus can end the song.

Verse bars 1–4 above chorus bars 1–4. Same key, same four chords, but the chorus sits higher, moves in longer notes, and its bar 4 holds the highest note of the song, F, over the F chord.

Write your chorus with the same tools as the verse: chord tones on beats 1 and 3, one motif, and a cadence at the end. Bar 3 of the example repeats the notes of bar 1 over a new chord, A minor, which shares C and E with C major.

Step 6: add the left hand

The left hand can show the change of section as clearly as the tune. Under the verse, hold the loop's shapes as block chords, an octave lower than in Step 1. Under the chorus, switch to the ballad pattern from Accompaniment patterns: root, 5th, octave, 5th in steady eighth notes, with F instead of the octave on G7. Block & Broken Chords compares the two deliveries, and The Ostinato offers a third option, one short pattern that repeats under everything.

Block chords under the verse, the ballad broken chord under the chorus. The left hand plays the same chords in both; only the delivery changes.

Write it down and map it

Copy the 16 bars onto Manuscript Paper as a lead sheet: the melody on one staff, chord symbols above it, the way Reading a lead sheet explains. A lead sheet tells a pianist what to play, not exactly how, so your left-hand pattern can change from verse to chorus without rewriting anything.

The whole example song as a lead sheet: an 8-bar verse and an 8-bar chorus. Write new words for a second verse and it is ready to become a full song.

Sixteen bars become a complete song when you decide the order. Write new words for a second verse, then try: intro, verse 1, chorus, verse 2, chorus, chorus. For an intro, play the last four bars of the chorus. To save writing it out, use repeat signs with first and second endings (Navigation Signs) or a D.S. al Coda for the last chorus (D.S. & the Coda).

One way to turn the 16 bars into a whole song. Verses keep the music and change the words; choruses keep both.

Ready for a bridge? Write four or eight bars that start on a chord other than C, such as F or A minor, and end on G7. Bridges commonly end on the dominant, so the chorus that follows sounds like coming home.

Free worksheets for every step

• Musical form — letters for sections, and four classical forms with famous examples.
• Label the form — label three nursery tunes, then four piano pieces.
• Phrase and period — question and answer phrases, with Ode to Joy.
• Cadences — authentic, plagal and half cadences as musical punctuation.
• Tonic & dominant — home and away, and why V leads back to I.
• Chords & Progressions in C — four smooth chord shapes and three loops, in every key.
• The chords of a key — the seven chords of a major key and their jobs.
• The primary chords: I, IV & V — the three chords that harmonize most simple songs.
• Primary Chord Patterns — I, IV and V7 in close shapes, in 4/4 and 3/4.
• Choosing chords for a melody — strong beats, harmonic rhythm and planning cadences.
• Non-chord tones — passing and neighbor tones and three more visitors.
• Improvising with the Pentatonic — five safe notes and a question-and-answer recipe.
• Motif and sequence — repeat, move and disguise one short idea.
• Find the motif and the sequence — four phrases to analyze.
• Accompaniment patterns — four left-hand grooves for the same chords.
• Block & Broken Chords — one chord, two ways to play it.
• The Ostinato — a repeating left-hand loop to improvise over.
• Reading a lead sheet — chord symbols and three steps from symbols to music.
• Manuscript Paper — blank staves for writing your song down.
• Navigation Signs and D.S. & the Coda — repeats, endings and jumps to map a song.
• The 12-Bar Blues — the twelve bars in close C, F and G7 shapes.
• The Pentatonic & Blues Scales — two scales for improvising over the blues.

Find more in the worksheet library.

Play it for someone

You now have the vocabulary: phrases make sections, sections make forms, and the three big forms are strophic, AABA and verse–chorus, with the 12-bar blues as a pattern inside a section. You also have a method: a loop, chord tones on the strong beats, a motif, a question and an answer, a chorus that stands out, and a left hand that changes with it. Write two songs this way before you break any of the rules.

Then play your song for someone. A Tissimo piano teacher can play it back to you, check that the chords fit the melody and help you write the bridge, in a live online lesson.

Sources

• Form in pop/rock music: Overview — Open Music Theory
• Form in pop/rock music: Formal functions — Open Music Theory
• Form in pop/rock music: Formal containers and module structures — Open Music Theory
• The blues progression — Open Music Theory
• Jay Summach, "The Structure, Function, and Genesis of the Prechorus" — Music Theory Online 17/3 (2011)
• Take Me Out to the Ball Game (York Music Co., 1908) — Connecticut College Historic Sheet Music Collection, via Internet Archive
• Jay Summach, "Form in Top-20 Rock Music, 1955–89" (PhD dissertation, 2012), as quoted in Open Music Theory's Formal functions page
• Copyright Term and the Public Domain in the United States — Cornell University Library
• Common Chord Progressions in Pop, Rock, Blues, Jazz, and Hip-Hop — Tissimo