The title name comes from the simple chord progression known as "twelve-bar blues."

The chordal structure, however, departs from that of twelve-bar blues.

The structure of the main riff is that of the twelve-bar blues.

As the title suggests, the piece follows a twelve-bar blues form in the key of C major.

The song, a slow twelve-bar blues, "is one of the most traditional in sound and form of all his official recordings".

Perhaps surprisingly, the structure of the song is a twelve-bar blues.

"All Blues" is a twelve-bar blues form in 6/8 time.

"Early in the Mornin'" has the structure of a twelve-bar blues with a strong rhythmic element.

He was particularly fond of the twelve-bar blues at slow tempos.

It is a twelve-bar blues set to a mambo rhythm.