As a scholar, he reconstructed Thomas Tallis’s great Mass setting for Christmas, Missa Puer natus est, and much of the surviving music by John Sheppard, whome he saved from oblivion. As a musician, he founded the hugely influential choir The Clerkes of Oxenford, whose distinctive sound and performing style paved the way for world-famous ensembles The Tallis Scholars and The Sixteen.