SPILLVILLE, Iowa – Here, the fields of corn and soybeans go on forever, and here the road into town makes incongruous turns in a territory whose byways are defined by 90-degree angles. Here, in the mere course of a magical summer 132 years ago, a community, a composer and classical music were transformed.Spillville is a speck on the map, home to 372 souls living 25 miles from the Minne...