twelve-bar

twelve-bar ▶adjective denoting or relating to a musical structure based on a sequence lasting twelve bars and typically consisting of three chords, the basic unit of much blues and rock and roll music. ▶noun a song or piece of music having such a structure.

twelve-bar

twelve-bar ▶adjective denoting or relating to a musical structure based around a sequence lasting twelve bars and typically consisting of three chords, the basic unit of much blues and rock-and-roll music. ▶noun a song or piece of music having a twelve-bar structure.