Um... Pretty sure it's either "Rolling in the Deep" or "Someone Like You" by Adele, being that both songs helped boost Adele's career and allowed her to be known as the savior of the music industry. Not even kidding, you can look it up. If Mariah or Gaga or any of them had the most successful album of the 21st century, they would've been named saviors of the music industry, but... They're not. Trust me, Adele wins.
saviour of the music industry ? thats just ur opinion. If Adele fails with her upcoming album she will be dragged to the deepest level of hell
There's not just one song that's the BEST, in order to really judge you'd have to know every song released in the millennium...........I doubt anyone does..