The timeless power of contemporary choral music

The vocal music of contemporary composers like Morton Lauridsen and Eric Whitacre, Ola Gjeilo and Caroline Shaw, is hugely popular with choirs, congregations and audiences. How do they achieve their brand of mystery and magic? Tom Service immerses himself in the resonant sound world of 21st-century choral music and discovers how it works. With guest, Kerry Andrew, who makes music for communities as well as choirs.