Some hymns simply have an extra sprinkling of divine magic. The first notes thrill from the organ, and we are home. There's little wonder that we refer to the majestic sound of choirs of angels: Surely the kingdom of God is full of the sound of singing. Author Richard H. Schmidt offers a homecoming of sorts in his newest book, Sing to the Lord an Old Song. His meditations on forty classic hymns remind us of a shared faith--by generations...