To some lovers of classical sounds, organ music seems irremediably goyish, despite outstanding achievements by such Jewish composers as Aaron Copland and Arnold Schoenberg in writing for the so-called “king of instruments.” For these, “The Organ and Its Music in German-Jewish Culture,” recently published in paperback, will be a real ear-opener. Its author, musicologist Tina Frühauf, notes that “until the Middle Ages, the organ was not officially permitted in any Christian liturgy inasmuch as instrumental music was associated… with the Jewish services once held in the temple at Jerusalem.”Even after organs appeared in churches and became taboo for synagogues, there...