Sam Tsui mashed together 14 of Britney Spears’ biggest hits making one epic track. All the tracks blend together more smoothly than I thought they would, seamlessly transitioning from her earlier songs to the later ones. Apparently her professional evolution is a lot less scary than her personal one.

He also shows how he performed the vocals and did the instrumentals instrumentals for the mashup through several different camera views.

 Watch it here: