sentences:  He used his violin skills during his DJ sets between 1999 and 2005.During his world tour with Tiësto in 2004, he played the violin during a live performance of "Lethal Industry", as well as being Tiesto's warm up DJ.In 2006, Coen Berrier (born 17 April 1979) joined Mason in the studio and during live shows, but left Mason in spring 2014.