Genre Lab 2 — Jazz (Post-Bop Small Group)

The Lab in One Sentence

The Jazz Lab develops adaptive harmonic listening, responsive ensemble conversation, and the PDC capacity to hear what a musical moment needs and contribute specifically that — skills developed through the post-bop small group tradition (Miles Davis Quintet era, Bill Evans Trio, Keith Jarrett Standards Trio).

Scope: Why Post-Bop Small Group

AMF's Jazz Genre Lab is specifically scoped to post-bop small group jazz. This distinction matters and should be stated clearly before anything else.

This characterization — interaction, harmonic adaptability, ensemble conversation — accurately describes post-bop jazz and the tradition that flows from it. It does not accurately describe all jazz:

Big band jazz (Count Basie, Duke Ellington, Thad Jones) emphasizes reading, intonation, section blend, and executed arrangements — nearly the opposite of spontaneous interaction.
Bebop (Charlie Parker, Dizzy Gillespie) prioritizes individual technical development, vocabulary speed, and solo elaboration over ensemble conversation.
Free jazz (Ornette Coleman, early John Coltrane, Cecil Taylor) involves collective exploration and ensemble density that replaces harmonic adaptability with something more radical.

AMF's Jazz Genre Lab does not attempt to cover these traditions. They train different and equally valid skills. Post-bop small group jazz is the tradition AMF uses because its core skills — listening before contributing, harmonic adaptability, responsive phrasing — translate most directly to the adaptive musician's goals.

Post-bop small group reference: Miles Davis Second Great Quintet (Miles, Wayne Shorter, Herbie Hancock, Ron Carter, Tony Williams), Bill Evans Trio (especially the Village Vanguard sessions), Keith Jarrett Standards Trio, Pat Metheny Group, Chick Corea Quartet.

Primary Internal Band Members Activated

Band Member	Role in Jazz	Activation Level
PDC	Adaptive listening — what does this moment need?	Maximum
TPS	Harmonic color, voicing choices, chord substitution awareness	Maximum
SHAPE	Melodic response, motivic development, solo phrasing	High
Blues Root	Feeling the phrase, note weight, emotional grounding	High
Rhythm Cells	Swing feel, rhythmic displacement, ensemble conversation	High
RXP	Lay-back feel, anticipations, swinging ahead of and behind the beat	Moderate
CAS/ARC	Solo architecture, when to peak, when to simplify	Moderate

The Musical Language

Harmony: Chord Extensions and Voice Leading

Post-bop harmony extends well beyond the dominant 7th foundation of blues. The working vocabulary:

Chord types and their colors:

Major 7th (Cmaj7): Stable, luminous, "home" color
Minor 7th (Cm7): Softer, more open — the ii in a ii-V-I
Dominant 7th (C7): The blues home; in jazz, a transitional function in V chords
Minor 7 flat 5 / half-diminished (Cm7b5): Passing color, often the ii in minor ii-V-I
Altered dominant (C7alt): b9, #9, #11, b13 — maximum tension before resolution

The ii-V-I progression: The backbone of jazz harmony. In C:

Dm7 - G7 - Cmaj7

Understanding ii-V-I in all 12 keys is a fundamental Jazz Lab skill. TPS develops the triad-over-root voicings that make these changes singable and colorful.

Modal harmony: Post-bop jazz also uses static modal harmony — a single chord or scale sustained for many bars (as in Miles Davis's "So What" and "Maiden Voyage"). This is a different skill from functional harmony: staying interesting and inventive over a D Dorian vamp requires melodic rather than harmonic motion.

Swing Feel

Swing is the defining groove of jazz. It is not simply playing with a triplet subdivision — it is a microtiming orientation where eighth notes are unequal in length and weight, where the pulse breathes forward and back across the beat rather than sitting rigidly on it.

The key qualities of swing feel:

The "long-short" eighth note relationship (but not mechanically 2:1)
Weight on beats 2 and 4 (the backbeat inverted from rock)
Rhythmic independence between the melody and the bass
Space — swing breathes; every phrase has silence after it

RXP and Rhythm Cells both develop here. Swing feel cannot be taught algorithmically — it comes from listening to and absorbing recorded swing.

Ensemble Conversation

Benjamin Givan's research (Music Theory Online, 2016) on jazz interaction notes something important: motivic interaction in jazz — where one player responds to another's specific phrase — is "only intermittently present" even in canonical jazz. Major figures like Sonny Rollins and Thelonious Monk explicitly wanted accompanists who would not react to their every phrase.

What this means for AMF's Jazz Lab: ensemble conversation is not about commenting on every phrase the other player makes. It is about:

Being present and alert so you can respond when response is right
Knowing when to hold back so your eventual contribution means something
Matching the energy level and texture of what is happening
Leaving space for the conversation to happen rather than filling it

PDC is doing the most complex work in this lab. The question "what does this moment need?" requires hearing what is already happening fully before deciding what to add.

AMF Focus Areas

ii-V-I in multiple keys: Learn to hear and navigate ii-V-I progressions in context. Not memorize — hear. When Dm7-G7-Cmaj7 appears, feel the pull and the release. TPS develops the voicings that make this feel inevitable rather than mechanical.
TPS harmonic adaptability: Jazz changes move faster than blues. TPS must move with them. Practice placing triad colors over moving bass lines — moving from one chord's color to the next without stopping to figure it out.
Modal playing: Hold space over a one-chord modal vamp and develop a melodic conversation with yourself. SHAPE is the primary system here. What can you say about D Dorian that takes five minutes without repeating yourself?
SHAPE motivic development: Take a motif and develop it across 8–12 bars. The jazz tradition rewards development — taking an idea, varying it, inverting it, displacing it rhythmically, bringing it back. This is different from blues call-and-response: blues speaks and answers; jazz develops an idea over time.
PDC adaptive listening: In duo or ensemble settings (or when playing along with recordings), practice the discipline of listening more than you play. Jazz small group PDC means 70% listening, 30% contributing.
Swing feel integration: Lock in the swing feel in Rhythm Cells before attempting harmonic or melodic work. Swing is the container; harmony and melody live inside it.

Entry Requirements

The Jazz Lab requires real AMF development before it is fully accessible. You need:

Solid PDC foundation — the habit of listening before contributing
Functional TPS vocabulary — basic triad shapes over roots in multiple positions
SHAPE development — ability to construct and vary a motif over at least 4–8 bars
Blues Lab foundation — understanding of call-and-response, the dominant 7th as a color, note weight
Ear development sufficient to hear ii-V-I motion (doesn't need to be named, but needs to be felt)

Approximate AMF readiness: Completion of Semester 1 (Blues Lab) and at least one additional Genre Lab (Rock or Funk). The Jazz Lab is an intermediate lab, not a starting point.

Listening Assignments

Track / Album	Artist	What to Listen For
Kind of Blue (full album)	Miles Davis	Modal playing; space; ensemble conversation; swing at slow-to-medium tempos
"Autumn Leaves" (Village Vanguard)	Bill Evans Trio	Interaction between piano, bass, and drums; voicings; space
"So What"	Miles Davis	D Dorian modal vamp; how to develop melodic ideas over a static harmony
The Köln Concert	Keith Jarrett	Extended solo improvisation; motivic development; how to sustain a musical idea
"Speak No Evil"	Wayne Shorter	Post-bop melody; how harmonic ambiguity creates interest
"Freddie Freeloader"	Miles Davis	Blues in a jazz context; how blues and jazz intersect
Waltz for Debby	Bill Evans Trio	How the piano voice leads; how chords and melody interweave
"Round Midnight"	Thelonious Monk	Harmonic boldness; deliberate spaces; how unconventional phrasing can be stronger than smooth flow

Practice Approach

Session structure (30–45 minutes):

Swing feel warm-up (5 min): Play a simple I-IV-V in swing feel. No melody. Just rhythm. Lock in the long-short eighth note feel. Then add a bass note below and a chord above. Feel the independence.
ii-V-I navigation (10 min): Practice ii-V-I in one key. First, just the roots. Then, TPS triads over each chord. Then, a simple melodic fragment across the change. Move to two keys.
Modal development (10 min): Take one chord (Dm7 or any minor 7th). Set a drone. Play melodic phrases over it using SHAPE. Develop one motif for at least 2 minutes before introducing new material.
Listening response (10 min): Play along with a recording, but only play when you have something to say. Count how many times you play. Count how many times you deliberately hold back. The ratio should be surprising.
PDC check: "Was I responding to what I heard, or was I executing a plan?" The Jazz Lab is the highest test of PDC listening.

Transfer

Skill Developed	Where It Transfers
ii-V-I harmonic navigation	Gospel (similar secondary dominant motion), neo-soul harmony
TPS adaptability under changing harmony	Every genre lab with moving changes
Modal playing (static harmony development)	Funk (dominant vamps), ambient lab
Motivic development and variation	Rock solos, folk melodic development, neo-soul improvisation
PDC adaptive listening	Every ensemble context in every genre
Swing feel	Neo-soul (modified swing feel), gospel (gospel "swing")
Harmonic ambiguity tolerance	Ambient lab, neo-soul rich harmony

Common Mistakes

1. Treating jazz as primarily a knowledge challenge. You do not need to know every chord substitution to play jazz. You need to hear the harmony and respond. Knowledge helps, but ears come first.

2. Playing too much in small group contexts. The genius of the Bill Evans Trio was partly how much they did not play. Density is not sophistication. Beginners fill space because silence feels like failure. In jazz, silence is contribution.

3. Ignoring the bass note. TPS voicings are about what happens above the root, but the root matters enormously. Where is the bass? What does the chord feel like with that particular bass note? This is Blues Root in the jazz context.

4. Playing bebop vocabulary from memory rather than developing real-time responses. Scales and licks are not conversation. Jazz small group requires real-time listening and response. Learners who have studied bebop lines often deploy them like pre-written speeches rather than dialogue. The Jazz Lab is not vocabulary accumulation — it is conversation development.

5. Not listening to the right jazz. Playing over jazz-style backing tracks is not the same as absorbing post-bop small group feel from recordings. The feel comes from the source. Listen to Bill Evans and Miles before you try to sound like them.

The Lab's Limits

This lab develops post-bop small group jazz fluency. It does not teach:

Bebop vocabulary (the full Parker/Gillespie/Bud Powell tradition) — this requires years of dedicated transcription work
Big band reading and section ensemble skills
Free jazz and avant-garde improvisation
Jazz arranging and composition at depth
Jazz repertoire mastery — AMF covers vocabulary tools, not the full Real Book
Jazz history and cultural context at depth
Latin jazz in its own right (see Latin/Afro-Cuban Lab)

Post-bop small group jazz fluency is a meaningful and transferable skill. It is not a complete jazz education.