An interesting article on some of the things mentioned here in the past.

Eventually, Arrangers Keyboards will be called Performer Keyboards. And instrument voices and musical styles will be trivial.

Rather than which brand sounds closer to a Tenor Sax, we will be discussing "which brand comes up closer to Elvis's voice?". It's true, we will hear 'Elvis' sing songs he never sang.

And in which key shall one sing it? No sweat, just speak into the mike and the Performer Machine will determine that.

Read more here:
http://www.reuters.com/news_article.jhtml?type=technologynews&StoryID=764437

mbl