Swedish House Mafia vs Britney Spears vs Jason Derulo vs Calvin Harris - DMC EXCLUSIVE by Bootleggers Music published on 2012/10/16 10:43:02 +0000 We're back with a brand new mashup featuring the final massive track by the guys at Swedish House Mafia. In this amazing mashup from the Bootleggers Music guys the vocals by Britney Spears, Jason Derulo and Calvin Harris battle for supremacy against the superstar DJs. Enjoy. Tracks used Swedish House Mafia feat. John Martin - Don't You Worry Child Britney Spears - Inside Out Jason Derulo - Breathing Calvin Harris - You Used To Hold Me All tracks remain copyright of their respective artists and labels. No copyright infringement intended. This track has been uploaded by Bootleggers Music purely for promotion use only. If you like the tracks, then please buy them legally.