It was held at the Chalk Farm Road Roundhouse Theatre and featured on the bill not only a public playing of "Carnival of Light" but performances by Unit Delta Plus, whose members included early electronic music pioneers Delia Derbyshire, Brian Hodgson from the BBC Radiophonic Workshop and fellow electronic artist Peter Zinovieff.
Peter Zinovieff lent part of his studio equipment - visitors could sing or whistle a tune into a microphone and his equipment would improvise a piece of music based on the tune.
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