Blues Chord Progressions

When it comes to popular music, it's hard to overlook the influence of the blues. You can hear it in everything from Led Zepplin to Nora Jones. It has also had a huge effect on jazz, pop and many types of folk music. There are a number of ways that you hear these effects. One of them is on chord progressions used in songs. Most people think that this is simply a matter of the I-IV-V blues form but it goes way beyond that. Today we'll look at some of the other common blues type progressions.

I-bIII-IV

This is the one that's used in all types of music from metal to dance. Some may think that it's a version of a minor chord progression but the main difference is the melody is a major scale played over the progression. A number of scales can be used over this progression; the major, blues and mixolydian scales are all available. This progression is used in two ways. First it's often used as the main idea in a rock song, usually played with a riff or reocurring line. It's also used in sequences where you would use a I-bIII-IV using the I chord and then transpose the entire progression up a fourth to be used over the IV chord. For example a E-G-A progression to a A-C-D progression.


I--IV-bVII-I

This is another progression that seems like it's 'borrowed' from the minor but like the progression above, it's used for major, minor and blues melodies. The bVII is often interjected into diatonic chord progressions but when used in this context it takes on the function of the V chord and pulls the harmony back to the I. Diatonic chords can be used with this progression but you'll often find that the progression on it's own pulls you in a more rock/blues direction.

I7-IV7-V7

You can hear the blues influence in this progression right from the first chord. Unlike a modal progression, all of the chords are dominant 7th which has a somewhat more 'unstable' sound than the straight major I. A number of scales can be used with this progression including blues, minor or major pentatonic, mixolydian, and major. Also, the b7th note in each chord may be used in the melody as a 'blue' note adding more interest. The progression is the core of the blues.

I7#9-bIII-IV


This the famous 'Jimi Hendrix chord'. Although used by many musicians, Jimi was the one that arguably made it famous. Sharp 9 chords are great for blues because they contain the natural 3 (from the harmony) and flat 3 (from the blues scale). Both rock and jazz musicians alike use this chord extensively when playing the blues as it tends to have more of a 'bluesier feel' than straight 9 (and especially b9 which lends more to a minor blues progression). The bIII and IV are added to finish off the progression although the sharp 9 chord will work with any blues progression.

I7-IV7-I-bVI-V7

This an added chord to end of the IV-V. A bVI chord is added to the turnaround to add a bit of spice. All of the chords in this example are major.

Im-IVm-V7(b9)

This the minor blues. There are many variations of this. The minors replace the majors in your standard blues progression. The flat 9 may or may not be used; it simply reinforces the minor sound. Minor 7ths may also be used.

Im-IVm-bVI-V7

Another variation of the minor blues. Often the bVI is added for a little more variety. Jazz musicians often take these progressions and add ii-V's and secondary dominants throughout the progression. Musicians like John Coltrane are famous for making up their own special variation of blues changes.

Just The Beginning

There are numerous variations of the blues. Too many to mention in this post. Any of the progressions listed above may be used in a 12 bar blues format or on their own. Many of these appear in pop, country and jazz tunes. There is no limit to the variations or ways in which you can use them. Take one at a time and explore the possibilities.

Intro To Pentatonic Scales

Most musicians are familiar with the pentatonic scales in one way or another. Most of the time it's usually learned early as a preparation for soloing and improvising. There are many pentatonic scales and many ways of using them.

It's Worldwide

Pentatonic scales are used in many types of music all over the world. Many different types of folk music use this scale. If fact most people are familiar with this scale without even knowing it because it's used so often. There's a great clip by Bobby McFerrin who sings a pentatonic melody to an audience and to their surprise, they finish the tune without him! African and European (Celtic, Scottish, Russian) folk music use pentatonics quite frequently.

It's Only 5 Notes

Most beginning musicians are familiar with only the minor pentatonic scale. In fact there are many different types. There is one based on the major scale, one on the minor, and many variations of these two. Basically a pentatonic can be defined as a scale with 5 notes...and that's all. It can be any 5 notes. So you can see how many possible permutations there could be. Also, pentatonic scales can be applied in different ways over different chords to achieve different results. In fact the major and minor pentatonics are the exact same notes applied in different ways over different chord progressions. That said, it's important to think of them in their own right i.e. the C major and A minor and not the C major starting on a different note.(It's important to think of all of your scales in this way i.e. A minor or D dorian and not C major.)

The Basics

Ok, let's start with the basics and go from there. The major pentatonic scale is the major scale without the 4th and 7th notes of the scale. These notes create certain tensions. Some music textbooks call them 'avoid notes' since they can sound 'wrong' when played at the wrong time.* The major pentatonic doesn't have these notes.The major pentatonic has the root, 2nd, 3rd, 5th, and 6th. That's it! The relative minor uses the same notes but the relationships end up being different. The minor pentatonic has the root, minor 3rd, 4th, 5th, and flat 7th. It's the minor scale without the 2nd and the 6th. (It's interesting to note that it's the 2nd and the 6th that differentiates the natural minor from the dorian and phrygian scales.) The blues scale is built upon this minor pentatonic but adds the flat 5th (the 'blue' note).

* There are no 'wrong' notes in music. There is only the situation where you are playing notes and not getting the desired outcome or sound that you intended.

Uses

The pentatonic scales are used in many ways. Initially they were used mostly in folk music as a basis for the melody and improvisation on that melody. They started to get used in jazz and rock and are used in almost every genre of music these days. The use of the minor pentatonic in rock music has almost become ubiquitous whenever you hear a guitarist going for a solo. Listen to any classic rock and guaranteed it's the scale used for the riff and solos and often the melody itself. Also, both the major and minor may be used in a song. The melody for the song will use the major scale but then the riff or solo may use the minor pentatonic. This happens in everything from country to rock.

Other Uses

There are a couple of other ways the pentatonic scales are used. First of all, since a pentatonic scale is technically any 5 notes, there can be many different possibilities for combinations. There are a number of different pentatonic scales*, quite a few of which have exotic sounds (and names). There is: Balinese, Chinese, Egyptian, as well as variations like the pentatonic Scriabin was famous for (a major pentatonic with a flatted 2nd).

*This is the Dolmetsch music theory site. Enter root note and scale from drop down menus to get the notes from any scale on the list!

Then there are the application of the major and minor pentatonic scales over different chords and keys. For example in the key of C major you could use the C major pentatonic (A minor pentatonic).  But you could also use other pentatonics like the E minor pentatonic or B minor pentatonic. Using these you end up playing different extensions over the chord. They can offer up some interesting sounds, especially when used in more elaborate chord progressions.

Start With The Basics

When teaching students how to improvise, I usually start with pentatonics. They're a great leaping off point for learning how to create phrases and exploring the musical thought process. By starting with a pentatonic scale over a basic chord progression, students find that improvising isn't the big mystery that they think it is. It's also easier to talk about (and actually hear) different ideas about phrasing, where to put your phrases and how to make a musical statement. It's easier to explain (and play!) question and answer (call and response) concepts. Once you get into the basics about how we create musical ideas, then you can get into some more advanced concepts such as motives, repetition, development, etc.

Explore The Possibilities

Even though there is only 5 notes, there is a world to explore in pentatonic scales. It's best to take them one at a time and see what can be done. Like everything else in music, it's better to know how to effectively use one scale, than it is to memorize a dozen without having a clue about how to use them. Take your time and explore the possibilities.

Cadences for the Rest Of Us

While studying theory and composition at university, one of the first things they talked to us about was voice leading. Voice leading is simply trying to find the best way of connecting the different voices in your harmony. You would start with a Cantus Firmus (fixed song) and work at writing counterpoint to that melody.

A big part of voice leading and counterpoint are cadences. Cadences are simply a way of ending musical phrases and ideas. There are a number of different cadences that happen in music. These are still just as relevant today although not used in exactly the same way. Today we're going to look at the different 'classical' cadences and see how they are used in today's music.


Following the Rules

When classical (i.e. classical, romantic, baroque etc.) musicians sat down to compose, there was a huge emphasis placed on voice leading and counterpoint. Classical musicians were preoccupied with the importance of the various independent lines, maintaining the voices and making sure there were no holes in their part writing (e.g. parallel 5ths and octaves). There were (still are) a whole set of rules that musicians would follow to make sure all of these things were taken care of. There were also other rules, like certain intervals (e.g. dim. 5th) and leaps that were to be avoided. Since the 20th century counterpoint has fallen out in place for more block and parallel lines. Most of the rules that were made for writing for band in the classical tradition were thrown out in the jazz era. Jazz musicians focused more on parallel lines, 'dissonant'* harmonies and swing. Voice leading though, is still an important part of writing and arranging in various styles.

*What at one time was considered dissonant (unpleasant, tense) may later be considered consonant (pleasing, no tension). It often happens that once people hear a dissonant interval or harmony often enough, it no longer is considered dissonant. Other general practices, (like always having to resolve suspended sonorities or ending on the I chord) no longer become particularly necessary. One of the trademarks of a innovator is someone who takes well known conventions and throws them out the window. Of course it helps if they do it in a musical and interesting way, instead of going against the grain just to be different.

The Perfect Cadence

With voice leading, it's important that the individual voices move in the proper way. There are predetermined ways to end phrases and pieces. For example classical musicians would always end a piece with a perfect cadence (i.e. a V-I progression in root position). This had an element of finality to it that was the norm and part of the style. When writing out a V-I, there are a number of ways to arrange the four voices*. If it was in the middle of a piece, the cadence had to be voiced a certain way, if it was the end of the piece, it had to be voiced another way. If you're wondering why most of the symphonies you hear end in the same way (the big repeating V to I), this is why. Beyond the theory with the individual voices, to most of us a perfect cadence is simply a V-I chord progression. This is considered the strongest progression in music simply because as soon as we hear that V chord, we immediately want to go back to the I.

*Classical musicians would often write out their voice leading in four voices (separate lines). This was a convention that started early in Western Music and is still done today, even though we often hear sonorities made up of more than 4 voices.

The Plagal Cadence

Beyond the V-I cadence, the other most used progression is the IV-I. This is referred to as the plagal cadence. Of course the voice leading rules that applied to the perfect cadence also applied to these. Whereas the perfect cadence had a finality to it, the IV-I progression isn't quite as strong. Where the perfect cadence felt more like a period, the plagal cadence was more like a comma. The IV almost feels like it could go anywhere; it doesn't have the strong desire to go back to the I. In this way the IV-I would often be used in the first part of a phrase letting the listener know that you weren't quite completely done.

The Imperfect Cadence


Whereas the perfect and plagal cadences both returned to the I, this cadence ends on the V. This cadence has much more of 'suspended' feeling. You are literally left hanging and seem to be waiting to hear the rest of the musical idea. It mostly stems from the strong urge of the V to return to the I. But in this case, it doesn't resolve.

Beyond the Basics

If you've studied music theory, you'll notice that these cadences are still the backbone of most of our music. There are books filled with 3 chord songs that use these progressions only. Don't be fooled by their simplicity, they're still very effective. If you're just beginning on your writing journey, don't be afraid to fully explore these basic progressions. They're effective because they work. Once you've gotten used to using these, you'll be able to use them in your own creations at will. Also, after using these for an extended period of time, you should be able to pick them out immediately in a song. Try listening to a song that has one of these basic progressions and see if you can tell what the chords are without your instrument.

So What??

So how can we use this in our writing? By knowing some of these conventions, we can use them (and go against them) at will. For example, try writing a short 4 bar phrase and end it with either a plagal or imperfect cadence. Notice how the music seems to begging for another phrase. Now write another phrase and this time end with a perfect cadence. See how the whole 8 bar phrase now seems like a logical sentence. Now that you know this, you can use this or go against convention on purpose. Try writing the piece but don't use any perfect cadences until your chorus. In fact try not to use the V chord at all. You'll notice that the cadence may have a different effect if it's only used once at a pivotal point (like at the end of the chorus) in the song.