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1970. Announcement Card (verso). Keith Critchlow and Alan Hacker's 'Sound in Space'. Presented by the RDG at Edinburgh College of Art.

25 - 29 August 1970. Announcement Card (verso). Sound in Space by Keith Critchlow and Alan Hacker, a 'musical environment' presented by the RDG in Edinburgh College of Art (contemporaneously with Strategy: Get Arts) for the 1970 Edinburgh Festival Fringe. Four 'experimental concerts' with music by Pierre Boulez, Harrison Birtwistle, Wanhal and Schumann were performed by Hacker and other musicians, with folk songs performed by Corinne, inside a spatial structure designed by Critchlow.