WATCH: The Year's Biggest Pop Music In A 5 Minute Mashup: United State of Pop 2015 (50 Shades of Pop) he always does at this time, DJ EARWORM drops a mashup of this years big pop moments. These get slicker every time, and this does a great job of capturing the textures that pervaded pop music in 2015, along with the tragic extremes of joy and downright pathos with little middle ground that made up the biggest moments of the year. However, its reliance on the disco beat DOES miss that beat-wise, trap was arguably more prevalent than ever, and anything, in pop music this year.