Pre-requisites Tonic Chord Prog #’s , Modes and Scales
The GOSk website says it best
“So what’s the difference? There is no difference; it’s the chords that create the magic. Playing a G Mixolydian scale over a C major chord will sound exactly like playing a C major scale (because they are identical). However, playing a G Mixolydian scale over a G major chord will sound “Mixolydian”.
Playing a D Dorian scale over a C major chord will sound exactly like playing a C major scale (because they are identical). However, playing a D Dorian scale over a D minor chord will sound “Dorian”.
Playing an E Phrygian scale over a C major chord will sound exactly like playing a C major scale (because they are identical). However, playing an E Phrygian scale over an E minor chord will sound “Phrygian”.
So there it is: it is the chord that you play the scale over that makes the difference
When you solo you have a lot of options about how to use scales; you can either:
- Play a proper modal scale in a different position over the major chord and have it sound identical to that major chord ex. D Dorian over C major
2. Play a mode over a major chord and create some tension with a slightly different sounding scale (works for some chords and fails for others)
3. Play over certain chord families with modes that the modal scale will go with (see Scales on Chords post)
4. Solo over a key (with one scale) using major or minor scales, or Mixolydian (dominant) -with a single or two scales – using 3 note per string or parallel scales
5. Solo with Pentatonics (using CAGED system) over a key or minor and major chords.
6. Using arpeggios over chord tones.
Playing a Modal Scale in a Key position
So if you start on the second note of an Ionian scale and end on that note; the notes you are playing are the same as the major scale. What’s the point?
Or if you play an actual dorian interval mode scale but start two frets above the root note – it’s the same scale, why bother?
Well emphasis and interval colour really are the only reasons really. They are not terrible reasons.
By emphasis I only mean where you stop and start a solo or phrase or what note you choose to let ring over a chord progression. If you hang on the 6th note that defines a Dorian scale you could be adding some small emphasis on that part of the major chord.
Could be that starting on a different scale position creates a lead note.
But since you are playing the same notes as the major scale you aren’t doing much of a different job than playing the Ionian.
Mainly though, it’s an inversion idea. It’s like playing a G chord on Capo 2 – two frets up from a non capo guitar playing an A chord. More notes from two different inversions.
Oh and if you want to riff off of the G form of the chord; your Dorian pattern – or derived riff – should fit right over it.
Ah, but the Dorian scale is a new interval pattern for your arsenal. Play a riff in the key position and you learn without accidental notes. THEN you move it down two frets and play the same pattern in all its Dorian minor tension glory. Playing two identical intervals on different parts of the fretboard. Happens all the time. I do it all the time.
Playing different modal scale over the same Key chord
This is where the fun begins. I play my B dorian riff over a B major chord. I add any notes outside of the major scale in B to colour the overall music. In this case the minor 3rd and major 6th should stand out – and the target notes in the riff should emphasize that. Will it sound chaotic or sweet. Well there are some rules but it doesn’t hurt to try – when alone and practicing.
I have a whole other post that states what chords different modes are often played over and what kind of mood the scale has. For now I will just add what target notes can be emphasized by using the modal scales over other keys or chords in a progression. And how to determine if the scale is appropriate.
Ionian major scale –
1, 3, 4, 5, 6, b7
The ionian scale mphasizes the key notes of a major key song and melody. Characterized by its 1, 3, 5 notes.
The Ionian scale is also the grandpa of all scale modes. Every other scale is derived from making changes to it.
The nice thing is that it can be played over any part of the song that is in the same key. Best when the key is also the tonic (the tonal center note and Scales that the bulk of the song revolves around)
The 4th note will sound temporary and a bit unstable. It usually needs to be resolved with the 3rd note.
(you may have to change to a different Ionian scale if they key changes or to another mode entirely if the dominant chord takes over the tonal centre of the song’s chord progression. More on those wrenches later.)
Dorian Mode
1, 2, b3, 4, 5, 6, b7
This very jazzy, mellow blues mode has a b3 (which makes it minor), a b7 (which makes it sound nice over any m7 chord) and it is defined by being the only minor key with a 6th – giving it a bright, almost major quality.
It’s good to use over minor chords not in the key of the song.
This scale is often mixed with the pentanonic minor and blues scales. The target note is the 6th.
Minor Bebop scale
1, 2, b3, 4, 5, 6, b7 7
Takes an extra 7th in the Dorian scale and adds it as a passing note. Used in jazz standards with The m7 chords in a minor blues progression, or the iim7 chord in a iim7-V7-Imaj7
Dominant Bebop Scale
1, 2, 3, 4, 5, 6, b7 7
Takes a mix scale and adds an 8th passing note 7th to it. Used to improvise over blues progressions and dominant 7th chord progressions
Major Bebop Scale
1, 3, 4, 5, 6, b7 7
Adds a 7th note as a passing 8 note to Ionian scale
Used with maj7 chords
Phrygian minor mode
1 b2 b3 4 5 b6 b7
I love this mode because I love Spanish Flamenco music. This is a very important minor scale in such music.
The target notes are the b2 and the b6
Because of the b7 this mode can be used with m7 chords. Be careful not to over use the b2 and b6 notes as they can clash.
Phrygian Dominant
(1, b2, 3, 4, 5, b6, b7)
Used a lot in heavy metal. The 3rd is not flattened.
Gypsy Scale / Hungarian Minor
(1, b2, 3, 4, 5, b6, 7)
A Phrygian scale with a non flat 3rd and 7th
Both the P Dom and Gypsy are good over major chords a half tone apart
Lydian major mode
1 2 3 #4 5 6 7
This isn’t a very exciting mode for me and I don’t use it often. Some folks use it to replace the Ionian because the 4th doesn’t clash as much.
It is good to use over major chords unrelated to the key of the song.
Lydian b7
1, 2, 3, #4, 5, 6, b7
This mode is used when a dominant chord V7th resolves to another chord, often a subdominant 7th, that is NOT the I; or in tritone substitutions – where a 7th is substitute with a 7th chord #4 (b) above it.
It happens to also be the 4th degree of the melodic minor.
Mixolydian Mode
1, 2, 3, 4, 5, 6, b7
Ah the mighty mix scale, also called the dominant scale. Used quite a bit over V7th chords; it also replaces the Ionian in songs where the 5th dominant chord becomes the root (tonal centre) of the song. If you have chord progressions where the V is so prevalent it is counted as the I, you need to use the mix mode instead of the major (ionian)
Used over 7, 9th, 11th, 13th chords. Often combined with major pentanonic scales
Like the major scale, the fourth is a careful note but sounds funky over 11th chords.
Aeolian natural Minor
1, 2, b3, 4, 5, b6, b7
The parent minor mode scale for relative minor chord progressions.
It can also be played over every m7th and diminished chord except the m13th (which has a 6th and will clash)
Melodic Minor scale
1 2 b3 4 5 6 7
There is no b6 in this scale and it is used more frequently than the natural Minor in jazz and fusion.
The melodic minor is sometimes used when ascending the minor scale and the natural is used when descending.
Harmonic Minor Scale
1, 2, b3, 4, 5, b6, 7
I love the classical dark tone of this scale as most rockers do. Having that natural 7th follow the flatter 6th is awesome to my ears.
When a dominant 7th chord resolves to a 1m then this is the scale to use.
Double Harmonic scale
A really fun heavy metal minor scale
Locrian Mode
1, b2, b3, 4, b5, b6, b7
The evil dissonant devil that’s rarely talked about in most Western music. 7th degree of the major scale it might fit over a diminished chord.
It’s a scale that always wants to resolve. Quite unfinished. I don’t know of many musicians who ever use it.
Locrian #2 / Aeolian b5
1, 2, b3, 4, b5, b6, b7
This more usable mode is also the 7th mode of the melodic minor scale.
Used mainly by jazz guitarists to solo over half diminished chords.
Super Locrian (b4)
on dominant chords with altered tensions (b9-#9-b5-b13)
How to use modes with chord changes in a progression
So far we have talked a bit about using certain modes over certain chords or progressions. However, we haven’t really touched on how to find out which modes to use in a particular song.
That process is not has hard as one thinks as long as you know that the chord voicings in a key are based on the same 7 modal changes as the notes of the major scale.
So basically all that you have to do is figure out the chord progression in a song and apply the modes to the chord changes.
So lets say you have a song that goes
I-V7-IV-ii – then you can see that the following scales fit
I – ionian (or lydian)
V7 – mixolydian
IV – Lydian
ii – Dorian
The complication is that you have to have the skill and wits about you to change modes with every chord. That takes a LOT of study and practice.
There is no rule that you have to change modes for every chord change in many songs either. You could use just the Lydian and Mixolydian scales in this song and it could sound find over the minor chord. You could choose not to solo over some chords as well.
Problems arise when the tonal centre shifts to other keys from the dominant chords to the sub-dominant chords (in a substitution)
For example
I-V7-II7-IV – the ii7 has been replaced by a subdominant II7 – the scale choice do Dorian for the ii7 would NOT fit
Bigger problems occur when there are key changes in the song. Of course you will have to change modes for the part of the song where the key changes.
For more on modes and their applications with specific chord families go to this link