Talent is a funny thing. It’s rare and elusive enough to be lusted after, to be treasured when found, and to be squandered with a single misstep. And yet, when it rains it pours, especially in music. In three years in the early 1940s, John Lennon, Paul McCartney and George Harrison were born a few miles from each other in Liverpool. In Vienna, within a few decades, Ludwig van Beethoven, Wolfgang Amadeus Mozart, Franz Schubert and Joseph Haydn converged to redefine Western classical music.