Choirs will come together in Dublin and Derry this weekend to commemorate a truce made during World War I.
The 'Voices of the Christmas Truce' remembers a 1914 pact, when solider's on both sides of the war called off the fighting for Christmas Day.
UK and German solider's played a game of football on December 25th 1914 in Flanders. Irish soldiers there also took part in the truce.
One of the Christmas Truce voices was a young British soldier, Albert Moren. He recalled the trenches near La Chapelle d'Armentieres in France, writing: "It was a beautiful moonlit night, frost on the ground, white almost everywhere; ... there was a lot of commotion in the German trenches and then there were those lights - I don't know what they were. And then they sang "Stille Nacht" - "Silent Night". I shall never forget it. It was one of the highlights of my life".
The concerts will take place at Christchurch Cathedral in Dublin and St. Colum's Cathedral in Derry on Saturday the 7th and Sunday the 8th of December.
The concerts mark the beginning of the WWI 'Peace Field Project' in Flanders, where the football game was played.
This has been developed by Derry man Don Mullan under the patronage of Archbishop Desmond Tutu and Brazilian soccer icon Pele.
Proceeds from the concert will go towards the Omagh-Waterford Peace Choir, the National Children's Hospital, Tallaght and the Little Prince Children's Hospital, Brazil.
Tickets are availbale from both Christchurch Cathedral in Dublin, and the Playhouse Box Office in Derry
