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The basic snoa will be taught, and there will be music by Sprida Ut, Kris Johansson and Nola and Brian Nelson featuring a combination of nyckelharpa, guitar and voice.

But that suited the music Hart was composing for a quartet of recorders, nyckelharpa — a medieval Swedish instrument — and a female choir singing alternately in Latin or made-up words.

The use of the nyckelharpa, a medieval hybrid of a hurdy-gurdy and a viol, adds the sense that despite the modern setting, we are witnessing an ageless folkloric morality tale about hypocrisy, moral rot and the oppression of women.

I spotted the founder, David Wilson, in the Russian-style tea room, playing an ancient lute called the nyckelharpa.

Debby likes to show off her nyckelharpa, a 16-string keyed fiddle from Sweden, and play the concerto she commissioned for the instrument.