Phoenix vs K'naan feat. Adam Levine - Bang Bang With A Lasso (2011)

                              Phoenix - Lasso (acapella)
                              K'naan feat. Adam Levine - Bang Bang (instrumental)

PJ Harvey vs Ellie Goulding - By The Writer (2011)

                              Ellie Goulding - The Writer (acapella)
                              PJ Harvey - Down By The Water (karoke instrumental)

Bondage Fairies vs Björk - Wanna Dance The Comet Song? (2011)

                                       Bondage Fairies - Wanna Dance
                                       Björk - The Comet Song (acapella)

             

            Big props to whoever created this video for the original song (cool video btw)
            I just added my mashup to it.