Ann Wilson has been penning poetry lately. “I consider myself to be a lyricist, now, especially,” the Heart singer, 75, says. “I’m really getting off on writing poetry and prose.” That practice has found its way into lyrics for new music tracing her life’s journey, which has become the subject of a new documentary. When she calls Rolling Stone , Wilson is days away from the premiere of Ann Wilson — In My Voice and just a few hours before a screening of the film at the Grammy Museum in Los