Context: Instruments have divided Christendom since their introduction into worship. They were considered a Catholic innovation, not widely practiced until the 18th century, and were opposed vigorously in worship by a number of Protestant Reformers, including Martin Luther (1483–1546), Ulrich Zwingli, John Calvin (1509–1564) and John Wesley (1703–1791). Alexander Campbell referred to the use of an instrument in worship as "a cow bell in a concert". In Sir Walter Scott's The Heart of Midlothian, the heroine, Jeanie Deans, a Scottish Presbyterian, writes to her father about the church situation she has found in England (bold added):

Question: Why were instruments more unwelcome to Christians?
Answer: They were considered a Catholic innovation

Question: What was the name of the book in which Jeanie Deans is the protagonist?
Answer: The Heart of Midlothian

Question: Who is quoted for saying instruments in religious services are like "A cow bell in a concert" 
Answer: Alexander Campbell

Question: Who authored The Heart of the Midlothian?
Answer: Sir Walter Scott

Question: What divides the worlds religions?
Answer: Unanswerable

Question: What was considered an Easter Catholic inovation?
Answer: Unanswerable

Question: What was first use introduced into worship in the 1800's?
Answer: Unanswerable

Question: Who opposed a capella music in worship during the 18th century?
Answer: Unanswerable

Question: What did Luther refer to as "a cow bell in a concert"?
Answer: Unanswerable

Question: What has divided Catholics since they have been used in worship?
Answer: Unanswerable

Question: What did Catholics oppose to be used in worship?
Answer: Unanswerable

Question: What did Martin Luther mention about using instruments during church worship?
Answer: Unanswerable

Question: What did Ulrich Zwingli write that had Jeanie Deans as the heroine?
Answer: Unanswerable

Question: What type of religion is John Calvin a member of in the book?
Answer: Unanswerable