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Jazz

Jazz is a music that grew in African-American communities in New Orleans in the early 1900s, mixing blues, ragtime, brass bands and church music. Its key features are swing rhythm (long-short beats), blue notes, syncopation, rich chords, call and response, and above all improvisation over a repeating chord pattern. Over a century it changed style many times: New Orleans, swing and big band, bebop, cool and modal jazz, fusion and today's global jazz.

🎬 Step-by-step story

  1. In a jazz band, drums, double bass and piano form the rhythm section. They keep the beat and play the chords.
  2. Swing: the two halves of each beat are not equal. Long then short β€” "doo-ba, doo-ba". Watch the ball bounce.
  3. The 12-bar blues is a loop of 12 bars. Colours show the chord: I (blue), IV (green), V (orange).
  4. Improvisation: the soloist makes up a new tune on the spot over the same chord loop. It is different every time.
  5. Jazz kept changing for 100 years: New Orleans β†’ swing β†’ bebop β†’ cool and modal β†’ fusion β†’ today.
  6. Try it: change the tempo and the swing amount, and pick an era. Clap along with the ball.

Tip: drag the 3D scene to turn it. Use two fingers to zoom.

πŸ€” Common doubts, cleared

Is swing written in the music?

Usually not. Quavers are written equal, and players know to swing them long–short.

How do players know when to change in a solo?

They count the 12 (or 32) bars and hear the chords from the rhythm section.

If it is made up, why does it sound right?

Soloists use notes that fit each chord, and practise patterns (licks) for years.

Why does a bebop recording sound so different from a 1920s one?

Faster tempo, small groups and more complex chords β€” the style had changed.

How much swing is right?

It depends: slow tunes swing more (near 2:1), very fast tunes are almost straight. Try the slider.

What makes music sound like jazz?

The band

A small group (combo) has a rhythm section β€” drums, double bass, piano or guitar β€” and front-line soloists such as trumpet, saxophone and trombone. A big band has sections of saxes, trumpets and trombones playing written arrangements. A walking bass plays one note on every beat, moving step by step through the chords.

Form: the head, solos and the 12-bar blues

Most jazz performances follow a plan: play the head (the main tune) β†’ take turns to solo over the chord pattern (each time round is a chorus) β†’ play the head again.

12-bar blues

Bars: I I I I | IV IV I I | V IV I I. Many jazz tunes use this loop.

32-bar song form

AABA: four 8-bar sections. The B section is the bridge, a contrast. Many popular songs used by jazz players ("standards") have this form.

ii–V–I

The chord move ii7 β†’ V7 β†’ Imaj7 is the most common progression in jazz. In C: Dm7 β†’ G7 β†’ Cmaj7.

How jazz changed: eras and key musicians

How to listen to and describe jazz

When you listen, ask:

  1. Instruments: which rhythm section and front line?
  2. Rhythm: swung or straight? Tempo? Walking bass?
  3. Harmony: blues, 7th chords, modal?
  4. Structure: head, how many solo choruses, trading fours (soloists swap 4 bars)?
  5. Texture: collective improvisation, solo + accompaniment, big-band sections?
  6. Era: which style does it fit, and why?

Use musical words and give a time point as evidence ("at 1:10 the sax starts a solo over a walking bass").

Key formulas and definitions

Worked examples

1. Write the 12-bar blues in G.

I = G, IV = C, V = D: G G G G | C C G G | D C G G.

2. At 120 BPM, how long is one beat?

60 Γ· 120 = 0.5 s. Swung, the long part β‰ˆ 0.33 s and the short β‰ˆ 0.17 s.

3. A track has fast tempo, sax and trumpet playing a tricky tune together, then very quick solos over changing chords. Which era?

Bebop (1940s): small group, fast, complex harmony β€” Charlie Parker style.

4. Name the ii–V–I in F major.

Gm7 β†’ C7 β†’ Fmaj7.

5. A piece stays on one scale (Dorian) for 16 bars while the trumpet improvises calmly. Which style?

Modal jazz, like Miles Davis in the late 1950s.

Common mistakes

Practice quiz

1. Jazz began mainly in:
2. In swing rhythm, pairs of quavers are played:
3. The 12-bar blues mainly uses chords:
4. Bebop is known for:
5. Which musician led modal jazz?

Practice: answer these yourself

Type or choose your answer, then press Check. Use a hint if you are stuck; the full solution appears after you answer.

Frequently asked questions

What are the main characteristics of jazz?

Swing rhythm, syncopation, blue notes, extended chords, call and response, and improvisation.

Who are the most important jazz musicians?

Louis Armstrong, Duke Ellington, Charlie Parker and Miles Davis shaped the main eras; later players like Pat Metheny and Gwilym Simcock took it in new directions.

What is the 12-bar blues?

A 12-bar chord loop using I, IV and V: I I I I | IV IV I I | V IV I I.

Where this is taught

NetherlandsVWO 6 (eindexamenjaar)Music and culture
England (GCSE, A level)Year 13Optional areas of study (choose two)

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