Every year, DJ Earworm takes the biggest pop songs of the year, grinds them down into one single song, and puts it up on the web. Once again, Earworm has capped off 2012 with his United States of Pop mashup, this time including Katy Perry, Ke$ha, Rihanna, Psy, Adele, Fun., Carly Rae Jepsen, Flo Rida, Bruno Mars, and other pop acts I haven’t heard of because my testicles have dropped.