BBC marks 90 years of radio with historic broadcast
14 November 2012 Last updated at 17:51 GMT
The BBC has marked 90 years of broadcasting with a simultaneous radio broadcast of a composition by Blur frontman Damon Albarn.
2LO Calling, a "snapshot of the airwaves" featuring iconic sounds such as Bertrand Russell in Morse code, was played to radio listeners around the world.
The broadcast at 17:33 GMT was hosted by BBC Radio 2's Simon Mayo from London's Science Museum.