Folk music and eerie choral swishing noises mingle as the choristers perform his work Improvisasjon.

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Steve Staruch, one of the choristers in this performance, said that Boyd's commitment to, and immersion in, the music was total.

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In the courtyard, the stone St Patrick's cross replicates the worn original in the Rock of Cashel's 15th-century Hall of the Vicars Choral, which was built to house the cathedral's male choristers.

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"Many of us have grown up with Islwyn and Norman regard them as the elder statesmen of the choir and we hold them in high esteem, not just as first-class choristers but true gentlemen, " he added.

BBC: Islwyn Morgan (left) and Norman Martin