What is the standard 12-bar harmonic blues progression often used by mid-20th century musicians?

The standard 12-bar harmonic blues progression that is widely recognized and used, especially by mid-20th-century musicians, is characterized as a sequence that uses the I, IV, and V chords in a specific structure. The correct structure typically follows the pattern of the first, fourth, and fifth chords in a key, repeated over twelve measures.

The most commonly accepted format for the 12-bar blues is structured as follows:

• The first four measures use the I chord,

• The next two measures move to the IV chord,

• Returning to the I chord for the next two measures,

• The ninth measure shifts to the V chord,

• Back to the IV chord in the tenth measure,

• Finally returning to the I chord for the last two measures.

While the choice indicating the progression I-I-I-I-IV-IV-I-I-V-IV-I-I appears to be almost structured for blues, it does not reflect the more standard layout as described above, which consists of a clear I-IV-I-V-IV-I sequence that allows for the call-and-response style integral to blues music.

Understanding that blues musicians often use this sequence creates a strong framework for improvisation and creates a familiar sound for both musicians and audiences alike. This progression fosters creativity, allowing