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Blues shuffles reinforce the trance-like rhythm and call-and-response, and form a repetitive effect called a "groove". The simplest shuffles commonly used in many postwar electric blues, rock-and-rolls, or early bebops were a three-note riff on the bass strings of the guitar. When this riff was played over the bass and the drums, the groove "feel" is created. The walking bass is another device that helps to create a "groove" . The last bar of the chord progression is usually accompanied by a turnaround that makes the transition to the beginning of the next progression.
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