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Pleasantly enough, Britten Sinfonia went down a thoroughly unconventional route in celebrating their 20th birthday at the Barbican on Saturday, with a brilliantly varied range of new pieces mixing with chamber orchestra classics.

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.