12 Bar Blues - A7 Rhythm Guitar Lesson The 12-bar blues is a fundamental chord progression used extensively in blues music and many other genres. It consists of 12 measures (or “bars”) and typically follows a specific pattern of chords.This structure creates a cyclic and familiar framework that provides a strong foundation for improvisation and songwriting. Check out my Patreon link to join a growing community and get immediate access to 325 lessons, exercises, monthly group lessons, song tabs a