Did you ever leave an opera performance wondering why the singers use so much vibrato? Or a symphony, wondering who decided where on stage the orchestra members should sit, or why they tune their instruments to an oboe rather than an electronic tuner? Why is Tchaikovsky's 1812 Overture played on the 4th of July? And how does a composer choose what key to compose in? In Who Knew?: Answers to Questions about Classical Music You Never Thought...