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Chant, Scottish culture and Judith Weir are the focus for this latest BBC Singers programme.

In 1993, by some strange musical alchemy, a creative partnership was born that has gone on to bear some remarkable fruit. On Officium, stylish jazz and classical label ECM brought together The Hilliard Ensemble – a vocal quartet known for the precision with which it had tackled and animated austere soundworlds from Perotin to Pärt – and Norwegian jazz saxophonist Jan Garbarek.

It has been nearly twenty years since the Hilliard Ensemble and Jan Garbarek released their first recording, Officium, in which the austere harmonies of medieval sacred music sung by the male voice quartet were augmented by Garbarek’s beautiful, freewheeling saxophone melodies.