Jazz is the style where theory pays off most directly. A jazz musician reads a chord symbol and knows which notes will sound right over it, and that knowledge is what makes improvising possible. Lessons build it on guitar, bass or piano, through tunes rather than worksheets.
Harmony
Jazz builds chords in stacked thirds beyond the triad. The four main seventh chords are major seventh, minor seventh, dominant seventh and half-diminished (minor seventh flat five). Extensions add the 9th, 11th and 13th for colour.
The central progression is the ii–V–I: in C major, Dm7–G7–Cmaj7. Many standards are chains of ii–V–Is moving through several keys, so hearing and playing it is the core of jazz harmony.
Rhythm and feel
Swing eighth notes are played long-short, on a triplet feel, with the accents on beats two and four. Comping (accompanying a soloist with chords) leaves space and answers the melody rather than filling every beat. Getting that feel right matters as much as the right notes.
On each instrument
- Guitar: compact three- and four-note voicings, comping, and chord-melody, where the melody is played on top of its own harmony. The hollow-body archtop is the traditional jazz guitar; the electric guitar types guide describes it.
- Bass: the walking bass line, steady quarter notes that outline each chord and lead into the next through scale and chromatic approach notes. See bass lessons.
- Piano: left-hand voicings, comping, and solo arrangements that carry melody and harmony together. See piano lessons.
Improvising
Improvising in jazz means following each chord as it passes: chord tones, arpeggios and approach notes, rather than one scale for the whole tune. It starts small, with two or three notes over a slow ii–V–I, and the vocabulary grows from there. Bill plays the chords while you solo, so you hear every note against the harmony it belongs to.
Where jazz comes from
Jazz grew out of the blues, and many players get there through it. Blues guitar teaches the dominant seventh sound, the 12-bar form and phrasing; jazz adds richer harmony on top. It is not a required first step.
Questions
Do I need to know music theory to play jazz?
It helps more than in most styles, but it is learned alongside the tunes, not before them.
Can I learn jazz on bass or piano instead of guitar?
Yes. Walking bass lines and jazz piano voicings are taught as well as jazz guitar.
