Taylor Swift vs. Britney Spears

Ke$ha vs. The Foo Fighters vs. Jay Sean ft. Lil Wayne Rihanna vs. Jakwob Armin Van Buuren Ft. Trevor Guthrie vs. Calvin Harris Ft. Example vs. Zedd Ft. Foxes Calvin Harris ft. Example vs. BoB ft. Taylor Swift Absolute Beginner vs. Alex Velea