Want to know what 2012 sounded like? For the past few years, DJ Earworm has artfully crafted one long year-end mashup for those who managed to avoid Top 40 radio at all costs. (For example.) Earworm goes beyond simply playing Gotye’s “Somebody That I Used to Know” over Flo Rida’s “Whistle”; the DJ manages to form an entirely new song — dubbed “United States of Pop 2012 (Shine Brighter)” — by cleverly sampling much of Billboard’s Hot 100 of the year and their accompanying music videos. When you hear all these pop songs rubbed up against one another, you quickly discover that 75 percent of the singles incorporate the word “tonight” in the hook, from fun.’s “We Are Young” to Katy Perry’s “Wide Awake.” Bruno Mars and One Direction get perhaps the most screen time, and contrary to reality, where “Gangnam Style” was inescapable for six months, PSY’s buffoonery only makes split-second appearances in “United State of Pop 2012),” with Carly Rae Jepsen stopping by for a cameo. See the full list of 25 hits crammed in here on DJ Earworm’s YouTube.