DJ Earworm released his annual mashup yesterday, United State of Pop 2011 (World Go Boom). It includes 25 of the biggest pop songs in 2011, and the year obviously belongs to Katy Perry.

He offered this explanation for his methodology:

It doesn’t match Billboard’s U.S. year-end list, since I’m basing it off of the weekly lists this year in order to more accurately reflect what was actually popular during 2011. Because of the Billboard’s early cut off date and their emphasis on chart longevity, songs that are released after August are either split between the two years or moved to the next year. I also don’t want a track appearing two years in a row just because it happened to be peaking right at the arbitrary cutoff date. From my perspective, a song belongs in the year it peaked, not the year it ended its long run. For instance, “We Found Love”, which has been #1 for the last 8 weeks of the year, is nowhere to be seen in Billboard’s Top 25, and may not make it next year either. This year-end bias seems inaccurate to me, and I want to more truly reflect the pop music scene from the American perspective.

Well, it’s just in time for Christmas – and you can download it for free here.

Track list:
Adele – Rolling In The Deep
Adele – Someone Like You
Black Eyed Peas – Just Can’t Get Enough
Bruno Mars – Grenade
Bruno Mars – The Lazy Song
Britney Spears – Till The World Ends
Cee Lo Green – F* You
Enrique Iglesias – Tonight (I’m Lovin’ You)
Foster the People – Pumped Up Kicks
Jennifer Lopez – On The Floor
Jeremih feat. 50 cent – Down On Me
Katy Perry – Firework
Katy Perry – E.T.
Katy Perry – Last Friday Night (T.G.I.F.)
Lady Gaga – Born This Way
LMFAO – Party Rock Anthem
LMFAO – Sexy and I Know It
Lupe Fiasco – The Show Goes On
Maroon 5 – Moves Like Jagger
Nicki Minaj – Super Bass
OneRepublic – Good Life
Pink – Raise Your Glass
Pitbull – Give Me Everything
Rihanna – S&M
Rihanna – We Found Love

Watch the music video mashup after the jump!