Willie Nelson and Merle Haggard are kindred spirits with a long history of collaborations—including the 1983 blockbuster Pancho & Lefty. The sweetly sentimental chemistry between the singers is heartwarming—whether they’re trading verses on Dylan’s “Don’t Think Twice, It’s Alright,” commiserating about a lost friend on “Missing Ol’ Johnny Cash," or delivering the wink-and-nudge double entendre of “It’s All Going to Pot.”