♪ shake, shake, shake, shake it off ♪ ♪ shake it off her mind-blowing song sales, promotional efforts, and expansion of her business empire made her the reigning queen of pop music. ♪ 'cause i'm coming at you like a dark horse ♪ >> the best-selling song by a female artist according to nielsen soundscan goes to katy perry's "dark horse" which moved more than 4.3 million copies. still, the guys were no slouches. ed sheeran hit it hard as the most streamed artist in the world, with 860 million listens to his tunes. especially "don't." ♪ with my love ♪ that heart is so cold ♪ all over my home >> it's angry, it's vengeful, it's primal, and it's really catchy which i mean, all of those are very good for a song. >> and billboard says the most weeks at number one on digital