Piano Lesson 11 - Blues Chord Progressions http://www.zebrakeys.com/lessons/beginner/chords/?id=11 - Learn the chords which are used in the 12 bar blues chord progression. The blues have been used as a basis for many types of music such as pop and rock. Chords Progression for the 12 bar blues are: 1st four measures, or bars: I, I, I, I. 2nd four measures, or bars: IV, IV, I, I. Last four measures, or bars: V, IV, I, I.