There was a time when Boz Scaggs would really sweat over the details of making an album — when he would agonize over every last note, melody or cowbell clang. In 2013, he released “Memphis,” which came after five years of touring — an album he recorded in less than a week with a group of world-class studio musicians in Tennessee. “It sounds easy, but we’ve got a lot of miles and experience between us,” Scaggs, 70, says in his signature baritone. On “A Fool to Care,” Scaggs goes back to his roots, with covers of deep cuts by Al Green, the Spinners and Curtis Mayfield. San Francisco musician Jack Walroth offered up the tracks “Last Tango on 16th Street” and “I Want to See You,” which give the album an elevated, worldly feel. Bonnie Raitt, meanwhile, lent her vocal and slide-guitar talents to “Hell to Pay,” the only original song on the album, salvaged from a rough cut from the late ’80s. “We sent her a demo, and she came up to my house and we spent a day together knocking it out,” Scaggs says. “The players didn’t know any of the material going into the studio, and they don’t need to,” he says. Aidin Vaziri is The San Francisco Chronicle’s pop music critic.