Choice: The critics
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Observe the Sons of Ulster Marching towards the Somme (right) Cancel all other engagements for Patrick Mason's mesmerising production of Frank McGuinness's overwhelmingly imaginative and richly authentic portrait of a group of First World War Ulstermen. Closes Saturday. The Barbican, London EC2

Passion Love, pain and the whole damn thing in Sondheim's latest musical. Jeremy Sams's production boasts that rare thing, a British cast with real vocal strength, in Maria Friedman, Michael Ball and Helen Hobson. In preview, Queen's Theatre, London W1

Lady into Fox Leah Hausman directs the latest music/theatre piece from the innovative Bartlett & Bloomfield team who created Sarrasine, A Judgement in Stone and Night after Night. With Dale Rapley and Louise Gold. Sheffield Crucible