Chord Progressions Vol. 1
Welcome back! If this is your first visit and you’ve missed our previous lessons, we recommend getting familiar with the material before jumping into chord progressions:
- The Major Scale
- The Circle of Fifths (A Guide to Learning Accidentals & Key Signatures)
- Music Modes
- Chord Inversions
And we’re finally here: Chord Progressions. Some of the issues we want to address in this post are the following:
- What is a chord progression?
- Why are some chords more closely related to one another than others?
- What do tonic, subdominant and dominant mean?
- What is a parallel chord?
- How does all this relate to degrees?
A chord progression is a set of chords following each other in a specific order. There are certain patterns as well as certain pairs of chords that do not sound especially good together. Regardless, there exist thousands of ways to combine a limited number of chords.
First, we will look at parallel chords. Their roots are always a third apart and they have two chord components in common.
For example, C and Amin:
The chord of C contains the notes C, E and G.
The chord of Amin contains A, C, and E, so C and E are the common, ‘shared’ notes.
To create or find parallel chords you move the chord structure up or down a third only using the notes of the key you are in. You will find that:
- The two parallels of a major chord are both minor chords. One of them is a major 3rd up, the other a minor 3rd down.
- Any minor chords parallels will be major chords. One a minor 3rd up, the other a major 3rd down.
The point of this is rather simple. As parallel chords have so much harmonically in common, they will sound well together, and as a result are used frequently in chord progressions.
Tonic, Dominant and Subdominant
A different approach; to think of chords of a progression in terms of their specific functions. The main functions are called Tonic, Dominant and Subdominant.
Important tip: always find the shortest way for each voice to move from one chord to another!
To better explain, it is best to look at the voices of chord progressions and examine how they move when a chord changes.
As always, it is not so easy to display this on guitar due to the tuning of the open strings. We will first show this in treble clef notation and later on give a few examples on the guitar.
In the key of C, the note C is the Tonic. The Subdominant is always the 4th degree, so in the key of C it is F. Let us have a closer look at the progression C – F – C:
First let’s assess the notes of both chords:
- C: C, E and G
- F: F, A and C
Both chords have one note in common, the C. If we move from the C triad to F triad, the C note remains constant. If we were then to pick the next note of the C chord, which is E, we must look for a way to move to the F chord in the ‘closest’ way. The note E will move up a half tone to the F. The remaining note of C is G. When moving to F, the G will go up a whole tone to A. This is the most economic way for the voices to move from one chord to another.
Looking at the voice leading of any chord progression will explain why they either work or do not work well. In this specific example it is important to see that the common note is actually the tonic root, which is why the change to F sounds stable. Harmonically then, two things happen:
- The change to F creates tension through two notes moving up; E to F and G to A
- The underlying common note of C makes the change stable
We can do the same thing on guitar in E, going E – A – E.
To see how the voices move:
The top E stays, the B moves up from the open string to the 2nd fret, the G# moves up one fret on the G string. For the bass notes we can use the open E and A string. We recommend using picking here.
Now we look at the progression C, G, C.
G is the Dominant, or 5th degree.
- Notes of C: C, E and G
- Notes of G: G, B and D
The voices move like this:
- The C moves down a half tone to B
- The E moves down a whole tone to D
- The G stays where it is
This chord change creates even more tension, because the tonic root C disappears in G. Still there is a common note (G) which makes the change stable.
To show this on guitar we use the same chords and fingerings as before. We now consider A as our key.
You can combine the Tonic, Subdominant and Dominant chords (degrees I, IV and V; 1st, 4th and 5th degree) in any order you like. They will always make harmonic sense and have been staples of western musical vocabulary for many centuries.
If you now consider the functions (Tonic, Subdominant, Dominant) as well as the parallel chords to each of the functions, you will end up with seven different chords:
- C (tonic); 1st degree (I)
- Am (parallel to tonic and subdominant); 6th degree (VI)
- Em (parallel to tonic and dominant); 3rd degree (III)
- F (subdominant); 4th degree (IV)
- Dm (parallel to subdominant); 2nd degree (II)
- G (dominant); 5th degree (V)
- B (parallel to dominant); 7th degree (VII)
These chords represent exactly the degrees of C major. But instead of just listing them going up or down the scale, we now can see how they refer to each other in terms of parallel and harmonic functions. When creating chord progression, the tonic and subdominant functions can very well be represented by their parallel chords. Two examples:
- Instead of F – G7 – C try Dmin – G7 – C
- Instead of C – F – G7 – C, try C – F – G7 – Amin
With the dominant chord G7, things work a little differently. It isn’t as easily replaced by its parallel chords.
The Dominant function as 7th chord
Let us have another look at the G chord, the 5th degree in the key of C. We can make it a 7th chord by adding another chord tone to the G triad (G, B and D). We have to use the next third up from D in the key of C major, which is F. The resulting chord symbol is G7.
When moving from C to G7 and back we have a little problem with voice leading. This is because G7 has four different notes whereas the C triad has only three. To make this as fluid as possible, let us cheat and omit the D in G7, using only the G, B and F:
- Notes of C: C, E and G
- Notes of G7: G, B and F
The voices move as follows:
- The C moves down a half tone (chromatically) to B
- The E moves up a half tone (chromatically) to F
- The G remains where it is
The dominant chord creates even more tension and goes back to C in a very pleasant way with two voices moving chromatically in countermovement. This resolves into the two most important notes of C major, which are the C itself and the major third – E.
Another advantage of this 7th chord is that we now have a common note with the subdominant chord F; the note F itself. So shifting from F to G7 is not simply moving up with all voices, and is given a little more stability by this common tone. Also, the G7 carries strong tension in itself because the interval between B and F is a tritone. Tritones are some of the hardest sounding intervals (not familiar with this? Then check our post on Intervals).
This progression is one of the few well depicted on guitar, using A and E7.
Again the top E stays, the C# moves up to D (one fret) on the B string while the A moves down one fret to G# on the G string. This works just as well in C.
Here you find a few exercises from the UBERCHORD app that use the chords we have discussed. Note that not all of them are in the key of C.
We will look at the main functions in minor keys for our upcoming posts. Please stay tuned to find out about some other very interesting ways of creating beautiful chord progressions by expanding your harmonic vocabulary and replacing certain chords!