Pink Floyd's The Dark Side of the Moon is to seal its place in history at the US Library of Congress as part of its National Recording Registry.

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In 2011, David and Burt Bacharach were awarded the Gershwin Prize for popular song by the US Library of Congress, the first time a songwriting team has been given the honour.

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The disc was too fragile to play using a needle so the museum, along with researchers at the US Library of Congress and the Lawrence Berkeley National Laboratory, developed an alternative play-back system that used light and a 3D camera to turn its bumps and grooves into sounds.

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