The rich polyphony of John Sheppard (c.1515-58), overlooked for centuries, enjoys a healthy respect these days, thanks to some scholarly rescue work in the 1970s. More recent reconstructions by Dr Magnus Williamson now allow us to hear yet more of Sheppard's glorious music for the first time. His fantastically elaborate Gaude virgo Christiphera suits the delightfully deft voices of St Mary's Cathedral, Edinburgh, as does another revelation: Hodie nobis caelorum rex, a plainsong responsory for Christmas morning, with a little choir of trebles and a tenor singing Gloria in Excelsis way off in the distance. Magical.