Vienna, May 19, AZERTAC  The First Semi-Final of the 2015 Eurovision Song Contest takes place tonight, 19th of May. Tonight 16 countries will compete for 10 places in the Grand Final. The broadcast will be hosted by Mirjam Weichselbraun, Alice Tumler and Arabella Kiesbauer who are eager to welcome the millions of viewers to Vienna for tonight's show - together with Conchita Wurst, the last year's Eurovision Song Contest winner, who will be a host from the Green Room.Sixteen songs will participate in the first Semi-Final, and professional juries in each of the participating countries, as well as in Spain, Austria, France and Australia, voted on yesterday's dress rehearsal. They account for 50% of the overall total.Each jury member ranks all the songs in the show by judging each song, each jury member should focus on the vocal capability of the artists, the performance on stage, the composition and originality of the song, and the overall impression by the act.The EBU's televoting partner Digame will merge the points given by the jury and the televoters tonight per individual country. If there is a tie between two or more songs between jury votes and televotes, then the song gaining the most televotes will be ranked higher.