New Year's Eve

Robin Thicke's 'Blurred Lines' was the biggest single of 2013 and was the singer's breakthrough song, thanks to its crazy catchy melody, sexy vibe and raunchy video. Thicke performed the song in Los Angeles and beamed into Ryan Seacrest's NYC-based 'New Year's Rockin' Eve' celebration.

Macklemore and Ryan Lewis acknowledged that they were an underground rap group when 2013 started. Now, they are one of the biggest acts in pop music. The pair performed on 'New Year's Rockin' Eve,' and before they took the stage in frigid NYC, they spoke to host Ryan Seacrest about scratching and clawing their way to the top.