4 Blues Chord Progressions You Need to Know Basic I7-IV7-V7 Blues. Another chord used in blues progressions is known as the 4 chord, also called the subdominant. The differences in the chord changes start in bar 8. In G minor, the 4 chord would be C minor. Blues progressions are almost exclusively played in 4/4 time and dominated by the root (I Chord), with the IV and V chords providing that extra bit of flavor to keep things interesting. Of course, you can play the blues in any key (if you really wanted … Blues Guitar Chord Progressions. Basic Jazz Blues. The final chord in typical blues progressions is the 5 chord, also called the dominant. In our key of G major, that would be C major. Here's an example of how a common blues progression goes: Measure 1: I Chord; Measure 2: IV Chord; Measure 3: I Chord; Measure 4: I Chord; Measure 5: IV Chord