10 Chord Scales via Modal Theory

7/24/2019 10 Chord Scales via Modal Theory

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133 1998 J. M. Goldstein

XI. Chord-Scales Via Modal Theory (Part 1)

A. Terminology And Definitions

Scale: A group of notes assembled in some sort of of ascending and descending order. A scale normally coversan octave, and usually moves in steps consisting of Major or Minor 2nds.

Diatonic Scale: The 7 note scale that is derived from the first 7 notes of a cycle of 5ths. (Eg. F C G D A E B =C D E F G A B C or D E F G A B C D, etc.) It consists of 5 whole tones and 2 semi-tones with the semi-tonesspaced as far apart as possible.

Chord-Scale:

A scale as seen in relation to a chord. Chord-scales are used as raw tonal material, a pitch collection, fromwhich to derive melodies and/or chord voicings on a particular chord type in particular harmonic situations.

Chord Tone (abbr: CT):

One of the component tones of a chord. Usually 1, 3 (or 4 in a sus4 chord), 5 or 7 (6 in a 6th chord). Usually

labeled as an interval which is smaller than an octave (i.e. less than 8).

Non Chord Tone (NCT):

A note that is not normally a component of the chord being considered.

Available Tension (T) (sometimes AT):

Any Non Chord Tone (NCT) that blends vertically with a chord when held for a long duration or accented.Usually found a major or augmented 2nd above a Chord Tone (CT) when examining a chord-scale. Usuallylabeled as a compound interval (9, 11 or 13) in a chord voicing.

When held for a long duration a tension will become part of the chord itself, in a pleasing manner.

For instance, sounding the note D for a long duration on a C major chord will result in the chord C(add9). The

D blends into the chord and becomes a part of it in a pleasing manner.When a Tension is actually a component of a chords voicing and not merely a melodic device we can treat itessentially as if it were itself a Chord Tone, in many ways. Tensions are usually visualized as being added to achord above the main body of the chord but they can be voiced lots of other ways as well depending on theskill level of the musician.

Avoid Note (AN):

Any NCT that clashes with a chord when held for a long duration or accented. Avoid notes often sound bestwhen they are resolved by half step (or step) into a nearby chord tone.

Avoid notes are usually found a half step above a CT.

Main exception: 9 on Dom7 chords is perfectly acceptable. 9 (aka 2) is a half step above the Root.Also: 13 on Dom7 chords is fairly routine. 13 (aka 6) is a half step above the chords 5th. But more often

than not the 5th is omitted from the voicing of a Dom713 chord. Therefore it is often written Dom7#5instead. (6 is enharmonically equivalent to #5.)

Avoid notes create harsh sounding 2 or 9 intervals with one of the chord tones. The 9 interval is the mostavoided interval in tonal music.

For Example:


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Sounding the note F somewhere above the E in voicing for a C major chord will create either a 2 or a 9 withthe E. In most melodic writing styles the 9 interval requires some sort of resolution into a more consonantstructure. The usual tendency of the note F on a C major chord is to resolve into the nearby chord tone E.

However, if the F is sounded below the E a less harsh major 7th interval is created. The resulting chord mightbe called C(add4) [C F G E - bottom to top - is one possible voicing] or C/F [F C E G] but its characterwould be quite different from that of a regular C major chord. Another possible chord symbol for this type ofvoicing is Csus4(add3). This is sometimes written Csus4(add10).

Note: On a Sus4 chord adding a major 10th (same pitch as a major 3rd) above the 4th creates no 2s or 9swith the 4th and is therefore an Available Tension! The resulting chord is often written as Csus4(add10). Somepeople prefer to refer to T10 as T17.

Another variation of this sound is voiced with the E and the F right next to each other, in a cluster (Eg. C E FC G). The chord might also be labeled C(add4) or Csus4(add3), etc. This voicing works because the min 2ndcreated by the E and the F is not exposed in the upper voices. The harsh sounding min 2nd interval is softenedby the intervals above it. If voiced C G E F it would be much less satisfactory.

If you find the note F when sounded above the E in a C major chord to be pleasing then to you that F isprobably an Available Tension. In some ways the idea of an Available Tension is subjective. The chordyou would be creating could be called C(add11) [voiced C E G F perhaps]. Most people avoid this sound how-ever. So on most chords that contain a major 3rd the Perfect 11th is considered an avoid note.

Avoid Notes are really not to be avoided per se. They just have to be treated a little bit more carefully than

most other notes and they should usually resolve into a nearby chord tone. An avoid note works very well as apassing tone between the two chord tones on either side of it. Avoid notes are often the notes that give a partic-ular scale its characteristic sound. If you leave them out entirely it is impossible to get the flavor of that scaleacross.

Chord Sound: If you add up all of the Chord Tones with all of the Available Tensions you have a group oftones that is sometimes referred to as chord-sound (i.e. all the tones that fit vertically on any particular chordtype).

Conditional Avoid Note (CAN) (my term):

A note that is usually stable (i.e. a CT or an AT) but one where certain circumstances might have it placed ahalf step above (or a min 9th above) another stable note creating an undesirable min 2nd and/or min 9th inter-

val.

Example:

On a Cmaj7 chord, sounding the note C (the root!) above the chord tone B will create a 2 or a 9 with the B.If C is the melody note on what would usually be a Cmaj7 chord, the chord is usually changed to either C6 orC6/9 or C(add9) in order to avoid this clash (aka rub). C itself is therefore what I call a Conditional AvoidNote on a Cmaj7 chord. (Even though it is the chords root!)

&wwwwC(add11) wwww

Cs u s 4(add10) wwww

C/F

wwwwC( a d d 4 )

F forms a 9 intervalwith the E below.

E forms a maj 7thinterval with the F

E forms a maj 7thinterval with the F below.

The harsh sounding min 2ndbetween E and F is balanced outby more consonant intervals on

either side of it.


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Another Example:

On the chord G7(13), sounding the note F (the chords 7th degree) above the note E (the chords added T13)will result in either a 2 or a 9 with the F. This is usually avoided.

These ideas of dissonance, consonance, the resolution of dissonant intervals, tendency tones, etc., ifnot already well understood, should be studied with a good harmony teacher or from a good text, like theDelamont books. Here, we will be dealing with these concepts in a much more casual way. Avoid notes willusually need to resolve into the chord tone immediately below (sometimes above). Available tensions (seebelow) can be used more or less freely almost as if they themselves are chord tones. As always, use your ears!

Modes: Historically the term mode was only applied to the scales that result by treating each degree of theDiatonic Scale as if it was the first and last note (finalis) of its own scale.

For example:

By emphasizing the notes D E F G A B C D and particularly the note D a key feeling quite different fromwhat we now call C Major was produced. That scale was said to be a mode of the diatonic scale. It is knownas the D Dorian Mode, sometimes the D Dorian Scale.

What we now call the Major Scale was (and still is sometimes) referred to as the Ionian Mode. Several hun-dred years ago the Ionian Mode was not nearly as popular as most of the other modes. It is a fairly recent phe-nomenon (approx. 1600) that the Ionian Mode or the Major Scale and its relative minor, the Aeolian Mode(aka The Natural Minor Scale), became so dominating of Western compositional practices.

There are therefore 7 possible modes of the Diatonic scale. For our purposes you can think of these modes asbeing much like inversions of the Major Scale.

Although the modes of the minor scales have been used to compose melodies within both major and minorkeys it would be pretty unusual for a composer to think of any passage of music, let alone an entire piece, asbeing in the key of one of the modes of the harmonic minor scale or the melodic minor scale. The modes ofthese scales are usually not quite satisfactory as tonal centers of their own. Some people would argue thereforethat these scales should not really be called modes but that wont stop me.

Around the beginning of the 1900s classical composers like Stravinsky, Debussy and Shoenberg were experi-menting with melodic and harmonic materials that were not so exclusively based on the major/minor keybased tonal system anymore. Later on several jazz musicians, like Miles Davis and John Coltrane, began toinvestigate the use of the Medieval modal tonal centers in a jazz setting. Jazz musicians have dabbled in atonaland pantonal music as well but by far the bulk of the jazz repertoire is based on the major/minor key system.

For our purposes the term mode will be used to describe a scale starting on a different tone than the one thatit is normally constructed upon. We will routinely be speaking about things like the modes of the Jazz MinorScale, the modes of the Symmetrical Diminished Scale, the modes of the Symmetrical Augmented scales, etc.

B. The Modes Of The Diatonic Scale

The diatonic scale has 7 possible modes. For example:

The 1st mode: C D E F G A B C is called C Ionian (aka C Major).

The 2nd mode: D E F G A B C D is called D Dorian.

The 3rd mode: E F G A B C D E is called E Phrygian.

The 4th mode: F G A B C D E F is called F Lydian.

The 5th mode: G A B C D E F G is called G Mixo-Lydian.

The 6th mode: A B C D E F G A is called AAeolian (aka A Natural Minor).

The 7th mode: B C D E F G A B C is called B Locrian.

Maj 7

(OK!)

2

(Be Carefull!)

9

(Be Carefull!)


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We will be looking at these modes as possible chord-scales for the diatonic triads and seventh chords that canalso be built upon the scale degrees of the C major scale. Each scale is notated to show the vertical relation ofeach scale tone to the notes in the chord being considered.

Legend For The Following Notation

CT T (or AT) AN CAN

Modal vamps (short repeating chord progressions) are given for practicing purposes.

1. Record these vamps using your guitar. Dont use your synth or computer if you have one to play the chords.Do use a metronome.

2. Practice improvising over these vamps using all of the fingerings for the C major scale that you know at thispoint. This includes single string playing, string combinations and all the possible Position Style fingerings. Ifyou know other ways to finger the C major scale then explore them too. Use these vamps as a means to famil-iarize yourself with all the various sounds contained within the C major scale and with all the possible finger-ings for the C major scale.

3. Transpose the vamps into all 12 keys using the circle of 5ths (I.e. C, F, B, E, A,D/C#, G/F#, C/B, E, A,D, G) and improvise over them with the corresponding major scales, exploring as many fingerings as you can.

This includes single string playing, string combinations and all the possible Position-Style fingerings. If youknow other ways to finger these major scales then explore them too. Use these vamps as a means to familiar-ize yourself with all the various sounds contained within all the major scales and with all the possible finger-ings for the major scales.

4. Learn to spot and resolve any Avoid Notes within these chord-scales. They are always a half step above achord tone.

Tip: Try playing the scales and omitting the avoid notes.

5. Learn to spot and resolve any Conditional Avoid Notes within these scales. Example: On Cmaj7 the note Bis much more stable than the note C (when C is sounded above the B in the chord voicing).

Tip: Try playing the scales and omitting both the Avoid Notes and the Conditional Avoid Notes.

What is left? Answer: Chord Sound.

6. Try to use the Avoid Notes mostly as passing tones to get from one Chord Tone to another.7. When non chord tones are available as tensions learn to construct shell voicings that that use those tensions.Memorize which tensions are available on which type of chord. Eg. What tensions are available on a IIm7chord? VIm7? IIIm7? etc. Imaj7? IVmaj7? etc.

8. Practice singing everything you are playing. Try singing something with one of these scales first and thenplaying it!

1. C Ionian (Mode 1 = Ionian)

R

(as I in C major)

C

3 5 R 29

3 (4) 5

13

6 77

R

R

Cmaj

3

5

7

R

9

2

3

(4) 5

136

7

(R)


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2. D Dorian (Mode 2 = Dorian)

3. E Phrygian (Mode 3 = Phrygian)

4. F Lydian (Mode 4 = Lydian)

R

(as IV in C major)

F

3

5

R

2

9

3

#4

#115

6

13 77

R

E

(or )E

Fmaj

R

(as IIIm in C major)

E

3

5

R

(2) 3

4

11

5

(6)7

7 R

R

E

3

5

7

R

(2) 3

11

4

5

(6) 7

R

R

D

3

5

6

R

2

9

3

4

11

5

6

(7) R

D

(or )E

G

R

(as IIm in C major)

D

3

5

R

2

9

3

4

11

5

136

77

R

R

D

3

5

7

R

9

2

3

11

4

5

136

7

R

R

C

3

5

6

R

9

2

3

(4) 5

6

7

7R

Cmaj Gsus4

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10 Chord Scales via Modal Theory