2015 had some truly memorable songs, particularly in pop music. What better way to enjoy them all as the year draws to a close than with a massive mash-up? DJ Earworm (aka Jordan Roseman) has been creating mash-ups of the 25 most popular songs each year since 2007, but this year he's upped the ante by combining 2015's top 50 songs into one mega-track.

This year's mash-up, titled "50 Shades of Pop" features songs from Justin Bieber, One Direction, Taylor Swift, and even latecomer Adele. According to Billboard, DJ Earworm has noticed some changing trends in recent music. "'Music has been going through a softer phase than it was a few years ago so there's that return of adult contemporary. That's maybe represented by the Ellie Goulding track, it's very lush and soft. And then there's sort of retro, uptempo dance stuff, and that's represented by The Weeknd track. It's a more eclectic mix than it was five years ago,' [DJ Earworm] explains about the diversity of tunes that blew up the charts this year."

You can check out the video for yourself over at Billboard.