Question: what are 12 bar blues chords?
Answer: The most common form of the blues is a 12-bar pattern of chord changes. That is, a repeated twelve-bar chord progression. ... In whatever key you are in, 12-bar blues uses the same basic sequence of I, IV, and V chords. It is most easily thought of as three 4-bar sections – the first 4, the middle 4, and the last 4 bars.