I will, however address one argument that I've taken interest in lately: that of sampling.
Recently I've started to look at sampling music in an entirely new light. People may say that it takes no talent to take a part of an old song and mix it in with a new song, but I'd really beg to differ - just look at any of the various mashup DJs producing music (Girl Talk's Night Ripper is a prime example). Any producer who can incorporate a sample into new material and make it sound good is a true music artist in my opinion, which leads me to believe that sampling really is a form of musical art.
Some examples of flawless sampling:
N.W.A. - Straight Outta Compton (samples Amen, Brother by The Winstons) - popularly known as the "Amen break")