You know the Staple Singers from their R&B, soul, funk, and gospel-infused hits (“Respect Yourself,” “I'll Take You There”), so you’re already familiar with the youngest sibling of the family vocal group, Mavis Staples. She’s got that warm, deep, enveloping vocal quality that feels like a hug. Her sound has gotten some modern polish over the last four albums, three with Wilco primary Jeff Tweedy at the helm, another tapping the talents of indie folk singer-songwriter M. Ward. Her 14th and latest soulful outing, We Get By, finds her hitting the studio with Ben Harper, who wrote and produced the 11-track LP, and lends his husky tenor to the title track. by Leilani Polk