Mavis Staples has achieved every one of her life goals—except for starring in a movie. “I told Justin Timberlake, ‘Look, Justin, your next movie, don’t forget about me. I’ll play the grandma,” says the 73-yearold singer, who began her career with family band the Staples Singers as a preteen in the 1950s. “He said, ‘Mavis, there’s no grandma,’ and I said, ‘There’s always a grandma!’”
Not that she would have time for the role if she got it. On June 25, Staples will release One True Vine, her second collaboration with Wilco’s Jeff Tweedy after 2010’s You Are Not Alone. After six decades as a civil rights and gospel icon, that multigenre set earned Staples her first Grammy Award and highest chart debut at No. 69 on the Billboard 200,…