Mason co-wrote the Eurovision Song Contest 2014-winning song "Rise Like a Phoenix", sung by Austrian artist Conchita Wurst, as well as the Slovenia's entry for the Eurovision Song Contest 2015, Here for You, sung by Maraaya and the English version of Serbia's entry in the Eurovision Song Contest 2015, "Beauty Never Lies", sung by Bojana Stamenov. In 2016, he wrote "Half a Smile", a song in the 2016 Switzerland selection for Eurovision.