The 1972 sophomore album Rio Grande Mud, by ZZ Top,turns 40 this month. Best known as home to the longtime concert favorite Just Got Paid, which features a particularly thrilling slide guitar showcase from Billy Gibbons.

ZZ Tops First Album yes, thats what they called it hadnt made much of an impression on the charts when it came out the year before, but Muds lead track, Francine, which featured vocals from bassist Dusty Hill, made a bit of a dent, becoming their first charting single. (Things would really bust open for the group with 1973s Tres Hombres.