Chances are you've probably heard Handel's Messiah at least once, if not many times. Maybe you've even performed it, as have countless musicians around the world. After all, it's probably one of the best-loved, and certainly one of the best-known, musical works in the standard repertoire. But if you thought you knew all there was to know about the great composer's famous oratorio, think again. For example, it may surprise you to learn that: ■ Handel's first impulse to compose the work came not from religious or even musical inspiration. It had a whole lot more to do with money. ■...