A popular biography of the legendary jazz pianist, composer and arranger gives a glimpse of how art can serve the pursuit of holiness.Among the popular biographies of notable Catholics in Liturgical Press’ series “People of God” are many household names: Dorothy Day, Flannery O’Connor, Oscar Romero, Thomas Merton, Sister Helen Prejean and, of course, Pope Francis. Its latest subject, Mary Lou Williams, is far lesser known — both as a legendary jazz pianist-composer and a devout Catholic. Williams, who died in 1981, believed jazz was “healing to the soul” and found a welcome home among churchmen and religious sisters who...