Martha Wainwright was desperately in need of a course correction after 2008’s “I Know You’re Married But I’ve Got Feelings Too,” which found the singer adrift as she forced her gifts into the mold of a run-of-the-middle adult-contemporary singer-songwriter. Having gotten an Édith Piaf tribute (and a baby) out of her system since then, she reorients herself admirably with “Come Home To Mama.”
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