Beyonce if you include her DC day. Beyonce if you only count 2003 and up, xcept with albums and tours. Oh, I just remembered how big Taylor is here.
+s for Bey though.
-She is the Billboard Radio Artist of the Decade (last time awarded). She has over 50 weeks at #1 in the U.S.
-At the moment she has sold only 1M less albums in the U.S. than Britney Spears (Beyonce will surpass her soon.
)