When we say the primary chords (I, IV, V) are popular, we ain’t kidding. They show up all the time in music. And while a lot of simple folk and pop songs use these triads, the most common example of a primary chord progression is what musicians call the “12-bar blues.” Without a doubt, you’ve heard of this, right? It’s played by repeating the same three chords over 12 measures. In a nutshell, it looks like this:
People call this “the blues” because it goes really well with the “blues scale.” And by adding a seventh chord here and there, we can create a tense, “bluesy” sound that feels like warm gravy poured directly onto the brain. In the key of C, for example, a blues progression and melody sound something like this:
Just like usual, we start at the tonic (I) chord. Then we make a short visit to our friend, the subdominant (IV) chord. After a couple of measures, we return to the tonic (I) … before passing through the dominant (V), again to the subdominant (IV), and finally home to the tonic (I) chord. Like a pleasant walk through the neighborhood, we eventually end up at home where we began.
The blues progression is so popular because it just sounds good. And it can be repeated as many times as you want. Once you make it through the first 12 measures, feel free to keep going … looping back through the same cycle over and over again.
By mixing it up a little—occasionally playing a seventh chord or tweaking the melody a bit—this progression makes for hours of fun. Using only those basic primary chords, we can play some very cool music. But of course, we have many more options, too. All we have to do is add a few chords to a song….








