December 8, 2015


The Ultimate 2015 Pop Playlist: 21 Songs That Dominated Top 40

#1Justin Bieber, "What Do You Mean?"

"What Do You Mean?" was not only important in being the perfect track to solidify Justin Bieber's comeback when it debuted at No. 1 on the Billboard Hot 100, but it helped usher in tropical-house sound to the mainstream. It recalls how Britney Spears gave the first mainstream nod to dubstep with her single "Hold It Against Me"--which also debuted at No. 1.

1 of 21