While The Highwaymen’s genesis coincided with 1976’s Outlaws album, their three successive collaborations barely gained a passing glance. Consequently, American Outlaws is as much an obit as it is an overdue offering from an honest-to-god country supergroup that now finds two members sadly departed (Waylon Jennings and Johnny Cash), one in decline (Kris Kristofferson) and a fourth (Willie Nelson) still braving the road at age 83. Each boasted their own pedigrees, but this brisk four-disc collection—three CDs and a Blu-ray taken from concerts at Nassau Coliseum in Uniondale, N.Y., in 1990 and two consecutive Farm Aid benefits in ‘92 and ‘93—captures the quartet at the peak of their prowess. There’s a wealth of hits—and subtle humor—found in these seamless renditions of individual classics (“Mammas, Don’t Let Your Babies Grow Up to Be Cowboys,” “Good Hearted Woman,” “I Still Miss Someone,” “A Boy Named Sue,” “On the Road Again,” et al.), which makes this set all but essential for any Americana aficionado. Indeed, American Outlaws raises the bar—perhaps literally as well as figuratively—and ought to give today’s feisty alt-country insurgents a second thought on how best to blend song and swagger.