This could easily be one of my favorite mashups of all time (along with Mashup Germany's). It is easy to put 14 songs together, but it is definitely not easy to make it sound this good. It takes time and skill. Here's Mochi Beats'Raging Levels
Artists featured: AVICII, Kanye West, Natalia Kills, Britney Spears, Ludacris, Soulja Boy, Beyonce, Salt n Pepa, Taylor Swift, Kid Cudi, Lady Gaga, Katy Perry, and Mike Posner.