Sung by Bob Marley and Johann Sebastian Bach, Muslims and Jews, Protestants and Catholics -- the Psalms never exhaust their impact.  Every day this ancient prayer book is used by left-wing Jewish feminists in New York’s Greenwich Village and right-wing, fourth generation Dakota ranchers driving F-150 pick-ups. Both an elegant court poet from 16th century Britain (George Herbert) and an impulsive rapper protesting drug deals on the tough urban streets of Chicago (Kanye West) quote psalms to comfort themselves and their listeners. Ageless, they are spoken with equal vigor by a monk chanting in a chilled medieval German cloister (Martin Luther), a priest orphaned as a teenager in communist Poland (Karl Wojtyla who became Pope John Paul II) and a modern-day Pakistani pastor in a half-built church struggling to find voice in Muslim culture. Whatever our continent or generation, the Psalms promise to nourish our soul.