Lisa Fischer is stepping into the spotlight at last. After four decades of singing background for icons like the Rolling Stones, Tina Turner, Chaka Khan, and Nine Inch Nails, she is finally offering her own humble, heartfelt song, accompanied by her inventive new band Grand Baton. The breakout success of the Oscar-winning documentary “Twenty Feet from Stardom” (2013) altered the course of her musical journey. Grand Baton’s organic fusion of African, Middle Eastern, and Caribbean rhythms, psychedelic soul, and progressive rock ignites Fischer’s flexibility and freedom of expression. Tickets are $35-$60.