On April 4, 1972, ZZ Top released their second album, Rio Grande Mud. The record is best known as home to the longtime concert favorite "Just Got Paid," which features a particularly thrilling slide guitar showcase from Billy Gibbons.

ZZ Top's First Album hadn't made much of an impression on the charts when it came out the year before, but Mud's lead track, "Francine," which featured vocals from bassist Dusty Hill, made a bit of a dent, becoming their first charting single. (Things wouldn't really bust open for the group until 1973's Tres Hombres.)

A vintage advertisement for the second LP declares that the band's reputation "has literally exploded throughout the South and Southwest," and a Rolling Stone review written shortly after the album's release seems to agree the trio is worthy of bigger things, stating that ZZ Top "churn out sizzling electrical blues in a style not far removed from John Mayall's original Bluesbreakers and early Fleetwood Mac" and promising, "With wider airplay and a little promotion, ZZ Top could ... reach the top."

With a title that trumpeted both their Texas pride and love of all things south of the border, Rio Grande Mud finds the band sounding more full-bodied and confident in the studio than on their initial effort. Throughout Mud's 10 songs, Hill and drummer Frank Beard provide a supple, rock solid and blues-heavy foundation for Gibbons' vocals and frequently stunning guitar excursions.

The frontman also proves himself quite a harmonica player, delivering gloriously unhinged work that contrasts perfectly with the rest of the traditional "she done me wrong" lament "Mushmouth Shoutin'." Another highlight: the weeper "Sure Got Cold After the Rain Fell," which is absolutely the best song in the world to play over and over again at 3AM after you've gotten your heart dragged through the mud.

For a long time, Rio Grande Mud was difficult to find in its original form. The dawn of the CD era coincided with the smash hit success of the band's synthesizer-heavy Eliminator album, and Mud was remixed to sound more like that album, or we guess "modern," and made available in the format only as part of a Six Pack collection for a long time. Happily, recent re-issues have restored the proper and original mix.

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