BBC marks 90 years of radio with historic broadcast
The BBC has marked 90 years of broadcasting with a simultaneous radio broadcast of a composition by Blur frontman Damon Albarn.
BBC radio stations across the UK and around the world marked the anniversary with a simultaneous broadcast of 2LO Calling, a "snapshot of the airwaves" featuring iconic sounds such as Bertrand Russell in Morse code.
The broadcast at 17:33 GMT was hosted by BBC Radio 2's Simon Mayo from London's Science Museum.
Will Gompertz reports.