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A Welsh composer has been chosen by Prince William and Kate Middleton to provide some of the music to be heard during tomorrow's royal wedding at Westminster Abbey in London.

The original work, Ubi caritas, written by 35-year-old composer , was premièred last October at St Andrew's University. The request to use it at the wedding came as a total surprise to Mealor, who was born on Anglesey.

"I was thrilled to hear that HRH Prince William of Wales had chosen my music for his wedding. How humbling it is for me to know that Prince William and Catherine will celebrate the beginning of their lives together with my music. The ceremony is going to be, without a doubt, the most emotionally intense and exhilarating hour of my life!"

Mealor has had to keep his extraordinary news a secret, even from his family. Only when the choral work is actually performed at the service will it be revealed to the world. The performance will be by the Choir of Westminster Abbey and the Choir of Her Majesty's Chapel Royal, St James's Palace, conducted by James O'Donnell.

The entire wedding ceremony, including Ubi caritas et amor, Deus ibi est (Where charity and love are, God is there), will be recorded and made available digitally the same day, with physical copies going on sale from 4 May.