The issue focused on how good an orchestra can sound when both instruments are playing at the same time. It's also how good a speaker can sound when both speakers are playing at the same time. 
 
 [Here's a link to the document](http://video.google.com/videoplay?docid=-394639494639394870552), but there are many many many good videos on how great music can sound when both instruments are playing at the same time. 
 
 Another example is how good a speaker can sound when