Out on the barren margins of Babylonian exile, the great Psalmist suggests their captors are actually asking for a song of joy. Imagine that. Is it possible to sing the Lord's song in a foreign land? Christians today find themselves caught up in the massive sweep of secularizing culture. Do we have a joyful song to sing anymore? Do we know what our song has been throughout history? Could we possibly sing as a mighty choir, just perhaps igniting spiritual renewal for our world–and for each...