---
title: 'How Does Jazz Improvisation Work?'
source: 'https://youtube.com/watch?v=Ate-6DO_lVA'
video_id: 'Ate-6DO_lVA'
date: 2026-06-28
duration_sec: 1302
---

# How Does Jazz Improvisation Work?

> Source: [How Does Jazz Improvisation Work?](https://youtube.com/watch?v=Ate-6DO_lVA)

## Summary

Jazz improvisation is a collaborative, spontaneous process where each musician has a defined role. The bass provides time and harmony, the drums embellish and interact, the piano comps chords, and the horn plays melodies and solos. A typical 12-bar blues form with specific chords and scales serves as the foundation for improvisation.

### Key Points

- **Bass role** [01:12] — The bass plays a walking bass line (quarter notes) to keep time and establishes harmony by playing root notes and chord tones.
- **Drums role** [01:57] — The drummer embellishes time, interacts with soloists, and drives the music forward, often using a swing pattern on ride cymbal and hi-hat on 2 and 4.
- **Piano role** [02:46] — The piano plays chords (comping) to support harmony, and can also play melodies and solos, improvising rhythms as long as chords fit the form.
- **Horn role** [03:59] — The horn section (trumpet, sax, etc.) plays melodies and solos, relying on the rhythm section for rhythm and harmony.
- **12-bar blues form** [04:28] — A common jazz form with 12 measures, typically using I7, IV7, and a turnaround (ii-V-I). In the key of F: F7, Bb7, Gmin7, C7.
- **Scales for chords** [06:44] — For each chord, a consonant scale is used: F mixolydian for F7, Bb mixolydian for Bb7, G Dorian for Gmin7, C mixolydian for C7. The blues scale is an alternative.
- **Personal sound and dissonance** [12:30] — Musicians develop a unique sound through tone, rhythm, and choice of consonance vs. dissonance. 'Outside' playing uses dissonant scales for expression.
- **Solo structure** [14:15] — After the head (melody), each musician takes a solo (often one chorus). Trading fours involves alternating 4-bar solos between instruments, and drum solos can be unaccompanied.

## Transcript

Theory with Bob
hey what's happening beautiful Geniuses
Trumpeter Bobby Spellman here and if
you're just getting into listening to or
playing jazz music or you're interested
in learning how to improvise on your
instrument you may be asking yourself
how does all this Jazz business work how
much of the music is improvised versus
written down what are the roles of each
of the instruments in a jazz band and
how is it possible that a bunch of
musicians can all be creating music
spontaneously without it sounding like
total chaos well today I'm going to try
to demystify the mechanics of jazz and
try to shed some light on why it is such
an exciting style of music to play and
to listen to but in order to do so I'm
going to need a Little Help from My
Friends
Julian Smith on the base
Evan Hyde on the drums
and Julia Chen on the piano
and we're going to do a little
demonstration of some of the mechanics
of how a jazz performance works and
plays through a little tune for you and
have some fun so let's get started we're
going to start out with the bass
[Music]
now the bass is the backbone of most
Jazz groups
the base has two very important jobs
simultaneously
first base player's job is to play the
time usually in the form of a walking
bass line
consisting of mostly quarter notes and
some Embellishments
and the other thing the bass player does
is establish the harmony by playing the
root notes and connecting them with the
chord tones and passing tones so the
bass player is going to be playing the
time while also holding down the harmony
for the rest of the band
and it's a big job
but Julian's capable of it he's the guy
are we gonna bring the drums now all
right Evan come on in with the drums
the drummer's job
is to embellish the time and to interact
with the soloists and with the melody
in order to drive the music forward and
give it a little bit more excitement
Evan here is playing a typical swing
pattern on the ride cymbal
and holding down the two and four on the
hi-hat
that leaves his left hand and his foot
to Accent the music
in any way he would choose
improvisationally
throughout the piece
now unliking Rock and pop music the
drummer has a lot of freedom to play
around with the groove so it's not a
strict drum beat but it can be a
variable pattern in order to be able to
interact with the other musicians while
we're improvising all right with that
we're going to bring in Julia on the
piano
and here we go
the piano's job
the chords
and help out with the harmony as well as
play solos and play melodies especially
in the case of a Piano Trio
[Music]
now once again in jazz unlike in rock
and pop music there isn't a set Rhythm
that The Pianist or other harmonic
instrument player needs to play but
rather they have the opportunity to
improvise with those rhythms as long as
those chords fit the underlying form
now this is called accompanying which we
shorten to comping so Julia what I've
been talking now has been comping and
she will accompany me when I play the
trumpet or play uh you know solos play
The Melody etc etc alright that brings
it to me in the horn section
now the horn section in a typical Jazz
combo or our jazz quartet or a jazz
group of any kind May consist of a
number of instruments including trumpet
trombone
tenor saxophone
saxophone any
clarinet flute sometimes you might have
a harmonica or a recorder or melodica or
some kind of other thing but uh our job
in the horn section is to play The
Melodies and to play solos
we in the horn section rely on the
Rhythm Section for the Rhythm and for
the Harmony and the Rhythm Section
relies on us in the horn section for a
tenuous sense of existential
reality for a for a sense of purpose in
all this music and together it's a
symbiotic relationship all right
so moving along the band as we've been
talking has been playing
a very common 12 measure form known as
the blues a blues typically consists of
12 measures and uh it can change a lot
there's a lot of variability in the
Blues form but very typically we will
have
four chords and they go like this the
one chord of the key the four chord of
the key back to the one
you stay on the one for another bar then
it goes to the four chord four
back to the one and the last four bars
of the Blues is called the turnaround it
goes two
five
one now this is a Blues in the key of f
so the chords are going to be F7 to B
flat seven to F7
[Music]
going on to B flat seven
flat seven
back to F7
once again to turn around we get G minor
seven
C7 back to F7 again
now most jazz tunes have a unique chord
progression based on The Melody of the
tune the atmosphere that the composer is
trying to create but a blues is one of a
number of forms that can be uh used for
a number of different tunes and provides
the basis for a lot of different tunes
that we play so Blues is the most common
form that you run into in jazz there are
a couple other ones that you see that
are common forms but certainly uh the
blues is a great one to start with
because we're dealing with a relatively
simple chord progression and it's really
the basis for what we do not only in
jazz but in rock and Funk and just about
all of American popular music alright so
now we're going to talk about how we
relate as improvisers to these
underlying chords
so for each chord in the form there is a
scale or mode that is most consonant to
that underlying chord so if we can learn
these various scales and how to
improvise with them how to invent
Melodies using these scales we can
relate to the chords in such a way that
the whole thing sounds harmonious even
though we're all improvising at the same
time so we're going to go over each
chord one at a time in the Blues and
talk about some of these scales that I
might choose to use so let's start with
the F7 so this is the one chord we're
just going to hang out on F7 we've
abandoned the form we're going to hang
out on F7 for a minute
on that F7 chord the F7 is an F major
Triad with a flat seventh on top so an E
flat
so that's going to sound like this
there it is
now I'm going to play generally speaking
on that F7 chord I'm going to play an F
mixolydian scale an F mixolydian mode
mixolydian is a major scale but with a
flatted seventh and that flattened
seventh is going to match with what's
going on in the chords and that scale is
going to sound a little something like
this
[Music]
hahaha
[Music]
[Applause]
[Music]
all right from our F7 chord we're going
to move on to the next chord the four
chord in the F major scale
and that is going to be the B flat 7
chord and we will come in right
here all right that's the four chord now
just like with the F7 is an f mixolydian
scale for the B flat seven I will tend
to use a B flat mixolydian scale which
once again is going to be the B flat
major scale for the flat seven and that
is going to sound like this
foreign
[Music]
now typically in the Blues form we go
back to the F7 but we're going to skip
ahead to the last four bars of the Blues
which is called the turnaround and the
turnaround gets us back to the top again
now the turnaround consists in this
particular jazz blues of a very very
common chord progression that we know as
the two five one and that is because it
starts on the second chord of the key of
f goes to the V chord and then we're
back to the one again so two five one
this is a little chord progression that
makes up a lot of different tunes that
you will hear but for now we're going to
stick to one chord at a time so we're
gonna go with G minor seven to start
it's going to be right here all right
now for the G minor seven
my tendency is going to be to use a g
Dorian mode which is going to be uh G
minor scale with a natural six flat
three flat seven but natural six and
that sounds a little something like that
[Music]
from there we move on to the five chord
coming to the end of the turn around
here and that's going to be your C7
chord and that's gonna sound like this
and for that just like with the F7 and
the B flat 7 I'm going to use the C
mixolydian mode and that's gonna sound
like this
[Music]
all right so those are the four modes
the four chords and corresponding
consonant modes that we might use on a
blues such as this and we're going to
return to the blues form now we're back
in the 12 Bar form known as The Blues
and we're going to take a little time
now to play a Melody that I wrote for
this occasion to avoid any copyright
strikes on my YouTube channel and then
I'm going to take a one chorus solo a
chorus is one time through the whole
form it's gonna sound like
hahaha
[Music]
hahaha
[Music]
now our option is to use some of those
more consonant modes that you've heard
but there's also a number of different
kinds of scales that you can use and
that's up to the improviser to decide so
one very common alternate scale I could
use would be the blues scale that's a
very common one and that's going to
sound a little something like this
foreign
[Music]
now one of the things that makes jazz
music so much fun is that each
individual musician has their own
personal sound and oftentimes you can
hear the way that a musician you can
identify a musician by just one or two
notes now a part of that musician's
individual sound is their tone on the
instrument uh you know what instrument
they're playing as well as what kinds of
rhythms and Melodies and what their
influences are any number of different
things that will make up a musician but
one of the things that you can also hear
in a musician sound is the way they
choose to use consonants versus
dissonance so very commonly you know you
would think of uh dissonant notes we
might have traditionally heard dissonant
notes as being referred to as wrong
notes but in our post Eric dolphy world
it's just another Choice any kind of uh
creative musician can choose to use more
dissonant sounds dissonant scales
dissonant intervals in his or her
improvisations and that's going to be a
part of his or her characteristic sound
so I'm going to show you a little bit
about what happens if I Take It Outside
of those chords that we played in those
regular modes and take it into a
different realm and that's going to
sound a little something like this
[Music]
all right so anything's possible here in
the world of jazz music or taking it out
we're having a good good old time here
all right so usually you will play the
head in the head in is the melody so we
played that already and then everybody
in the band will take a little solo
we'll trade around it could be any
length but for now we're gonna stick to
one chorus and we're gonna start with
Julia Chan on the piano
[Music]
foreign
[Music]
for Mr Julian Smith
[Music]
all right and once everybody takes a
solo of their own chosen length whatever
the however much they they want to say
in the whole grand scheme of the form
comes time for the drum solo now there's
a couple different options that we have
with the drum solo but one option is
called trading fours and in trading
fours what we're gonna do is each of us
will go around in the band and take four
bar improvisations trading with Evan
over here on the drums throughout the
form so we're gonna stick with the form
but we're just each gonna take a little
four of our solo now you could trade
eights you could trade 16s you could
probably trade 32s or 64s but it might
get a little unwieldy so we're gonna
stick to Fours for now and that sounds a
little something like this
foreign
[Music]
now that's one option for a drum solo
the other a very common option is for
the drummer to take an unaccompanied
solo and even though the drummer is
going to be playing by himself without
any kind of accompaniment by any of the
harmonic instruments he's still gonna
follow the form so he might play one
chorus two chorus three choruses however
many courses that's gonna sound like
this in this case we're just going to
take one chorus of drum solo here we go
Evan hide
[Music]
all right now typically after the drum
solo we'd go right back into the head
out just like the melody in is called
the head in the melody on the end of the
tune is called the head out so we're
going to play the head out now for you
and close out this tune
hope you had a little fun here we go
[Music]
and that's a little introduction on how
Jazz improvisation works we got the
instruments in a regular Jazz combo
there may be many other different
instruments that we haven't covered here
and anything it goes but for now this is
a very standard instrumentation after
that we've got the chords of the tune
once again the blues is just one of a
number of different forms usually jazz
tunes will have their own unique chord
progressions but it's a good place to
start with the blues because it's a
common one that you will run into
regularly we got four chords in this one
each of those chords has a scale that is
most consonant to that chord that we can
use to create Melodies at any given time
any one of us in the band becomes the
composer so it's always a very exciting
it's an exciting style of music because
all of a sudden the job of the
individual musician becomes the job of
the composer in a spontaneous fashion
and we all will interact with each other
we all have the opportunity to listen in
very closely to what the other one is
playing and to try to interact in such a
way that we can make beautiful music and
have a good old time after that we're
able to expand on what we're doing
beyond the normal chords that we have
and really try to capture some
interesting rhythms and and in the whole
process of the thing really try to
capture our own view of the very essence
of The Human Condition and try to convey
that through sound to the adoring fans
in the audience all right gang and that
is a little bit on how to Jazz
all right gang and there you have it a
little rundown on the fundamental
mechanics of how jazz music works hope
that clears up a little confusion
surrounding what's going on while we're
playing and I hope it inspires you to go
check out some great records go check
out some live music and pick up your own
instrument go hang out with your friends
and try some of these ideas out for
yourself if you like this video be sure
to give it a like And subscribe to the
channel for more videos on jazz music
improvisation and music theory going
forward also if you have any questions
on any of the topics that we covered in
this video be sure to leave them in the
comments below and I'll do my best to
get back to you and clear up any
residual confusion on the topic at hand
alright gang well until next time be
sure to go check out some great records
and have a lot of fun with it and I'll
catch you on the next one see ya
Theory with Bob
all right friends thanks so much for
checking out this video I hope it helped
in your understanding of the musical
world and in your pursuit of the Majesty
of musical self-expression if you like
this video you can let us know by giving
it a like and be sure to subscribe to
the channel for more musical education
videos going forward you can also follow
me on Instagram at Bob Spelman for some
more musical fun the Ridgewood school of
music is now accepting new students
online as well as in person in the
Brooklyn Queens and greater New York
City area you can find us on our website
at
www.ridgewoodschoolofmusic.com or you
can send us an email at Ridgewood
schoolofmusic gmail.com and we'll get
back to you as soon as we can try to set
you up with a great teacher for the
kinds of music that you're looking to
study all right gang well thanks again
and until next time happy practicing
foreign
[Music]