ZZ Top - DeguelloBilly Gibbons, Dusty Hill and Frank Beard already mastered the Texas boogie perfectly on their second longplayer Rio Grande Mud, even if the focus was even more on blues rock here. The lesson they had learned between their debut and this LP was that blues feeling, rocking guitar sound and a good portion of cool detachment also require a suitable black funk groove to round things off and make them so irresistible (danceable) "Francine", for example,