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“What is a score?” This was the question posed last night in Kings Place, Hall Two, by the effervescent ensemble who style themselves as notes inégales. Under the directorship of Peter Wiegold, six instrumentalists brought together a programme of improvisational works that responded to computer-generated scores on a large screen.

Now they know how many cacti it takes to fill the Albert Hall. Last night’s marathon John Cage Prom finished up, over three hours after it had started, with a wonderfully cactus-heavy performance of Branches (1976).

Bang on a Can were gentle with their London audience last night, giving the UK première of their Field Recordings project, a sequence of nine new compositions which all involved recorded sound or video samples.