Kit Harrington stole the headlines as his latest period drama, Gunpowder, brought Robert Catesby’s 1605 bid to blow up the House Of Lords to BBC One last month. But as viewers would surely testify, the music was instrumental, too.

German composer Volker Bertelmann (Lion) records and performs as Hauschka, and says he was prepared to plumb some murky depths.

“When I saw the show I had the impression that it would be best to work on a dark score with ...