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Welcome to the award-winning Scotsman Sessions. With performing arts activity curtailed for the foreseeable future, we are commissioning a series of short video performances from artists all around the country and releasing them on scotsman.com, with introductions from our critics. Here, Aidan O’Rourke – fiddler, composer and one-third of Lau – plays two waltz compositions, the latter inspired by a short story by James Robertson