An audition stage took place between 6–27 November 2016, to determine which acts would proceed to the next round of qualification. The semi-finals which took place between 17–19 February 2017, were divided into five categories (male voice; female voice; mixed; youth; and children's choirs) with the winner from each of the competing categories advancing to the grand final on 9 April 2017. Côr Merched Sir Gâr won the final of Côr Cymru 2017, and will represent at the Eurovision Choir of the Year 2017.