'Radical' Barenboim piano unveiled

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Will Gompertz is at the unveiling of the Barenboim piano in London.

Daniel Barenboim, one of the world's most distinguished conductors and pianists, has unveiled a new type of grand piano.

He says it is "radically different" to the standard concert grand as it is built with straight, parallel strings that produce a superior sound.

Here is my report from the Royal Festival Hall on London's South Bank where the piano is being unveiled.