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Outlook's Matthew Bannister visits King's College Chapel in Cambridge, the home of the King's College Choir.
Known all over the world, the choir performs the Festival of Nine Lessons and Carols on the ´óÏó´«Ã½ World Service every Christmas Eve.
First broadcast in 1928, the service is now heard by millions of people all over the world.
For Matthew, though, King's College Chapel holds a special place in his heart - when Matthew was a young chorister aged 13, he sang in a service at the chapel.
During his visit Matthew also meets some of the people involved in the choir, including Alex Stobbs, a 19 year old choral scholar at King's College.
Alex was born with cystic fibrosis - a disease which attacks the lungs and means the digestive system gets very congested.
But none of that has stopped him from following his passion - and that passion is music.
Alex was a chorister at King's College Cambridge from the age of nine - and he is now a full time student at King's College.
He tells Matthew why he believes the Festival of Nine Lessons and Carols is so unique, and how he manages to juggle singing in the choir and concentrating on his studies.
Matthew also meets Acting Dean of King's College Chapel, Richard Lloyd Morgan, who remembers the time he heard the Festival of Nine Lessons and Carols when he was in the rainforest in Madagascar.
And he meets the choir's Director of Music, Stephen Cleobury, who describes his own feelings as the red light comes on, signalling the start of the Christmas Eve broadcast.
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