Gospel matron Mavis Staples’ remarkable third act continues with Livin’ on a High Note. Her fourth album for ANTI-, a rootsy sister label to the punk institution Epitaph, High Note draws on her reputation as a Civil Rights unifier (with the Staples Singers) and voice of moral dissent, featuring songs by likeminded outsiders Nick Cave (the haunting and spare “Jesus Lay Down Beside Me”), Neko Case (the protest-minded “History Now”), and Bon Iver’s Justin Vernon, all upheld by Staples’ frank, powerful voice.