Folk music and eerie choral swishing noises mingle as the choristers perform his work Improvisasjon.
BBC: Musical destinations: Trondheim, Norway
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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.
NPR: 'The Childhood Of Christ' In Concert
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Men have sung in falsetto for centuries from 17th-century English church choristers to The Bee Gees, Prince and today's operatic superstar counter-tenor, David Daniels.