This mashup is for all of you who may have just been hiding in a cave over the past year. Musician Chad Neidt has taken twenty songs that were virtually inescapable in 2013 and combined them in one mash-up full of Miley, Taylor and, most impressively, the Harlem Shake. So unless you have been playing World of Warcraft for 12 months straight without any sleep or bathroom breaks, you have most likely have heard many of these songs.