After a four-month-long exercise, Billboard announced its greatest pop star of the 21st century, but not without controversy.

You can see the stars who have made our list so ... the century in Lady Gaga, a game-changing phenomenon whose peerless opening run continues to loom large in contemporary pop music.

Lady Gaga joins Maroon 5, Taylor Swift, and Miley Cyrus as she and Bruno Mars push "Die with a Smile" to No. 1 on Billboard's ...

Lady Gaga and Bruno Mars’ duet, “Die With a Smile,” becomes the fastest song to reach a billion streams on Spotify. Lady Gaga ...

Lady Gaga raised the bar for all of pop stardom in one absolutely unforgettable breakout year. By Hilary Hughes (In 2018, the Billboard staff released a list project of its choices for the ...