First, the empirical evidence. Shazam, the magical app that identifies songs for you, has revealed their list of the songs people inquired about the most.
1. "Blurred Lines" by Robin Thicke: 17.8 million times worldwide.
2. "Wake Me Up" by Avicii: 14.7 million
3. "Thrift Shop" by Macklemore & Ryan Lewis: 13.6 million
You get the idea. See a report here.
Given how many zillions of times these songs were played over the past 12 months, no wonder you can't get them out of your head. (Via Mashable)