'Hallelujah' by Leonard Cohen is one of the most well-known worship songs today. Many artists have shared their renditions of the song including, Bon Jovi, Justin Timberlake and Susan Boyle. 2CELLOS is made up of Luka Sulic and Stjepan Hauser, who are from Croatia and have been household names for nearly a decade. The pair went viral with their version of 'Hallelujah' where they shared their breathtaking talent with the world.