Pretend though we might to the contrary, pop music isn't like sports—there's barely ever a definitive winner or a definitive loser. Through our calculations, we concluded that Lady Gaga was the greatest pop artist in the game in 2011, but our word on the matter is by no means final. So we're giving you, the readers, a chance to weigh in. Check out our poll below and cast your vote as to who you think should have topped our list—Lady Gaga, or one of the other highly worthy artists in our top ten.