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The voices of Trio Mediaeval take you by surprise. Essentially, they take French, English and Norwegian polyphony and give it an electronically amplified, spaced-out twist. Much of Norway’s early musical history is unknown, the largely Christian folk tradition passed down orally rather than in writing, although monasteries from the 12th century onwards played a large role.

It's not often in classical music that the performers themselves are the main focus of our attention; more often than not they are at the service of the composer. But this evening was an exception to the rule, showcasing the multi-talented Joanna MacGregor and Arve Henriksen.