Founding Myths.- 'Get Another Electrician'.- The Making of Radio Free As Air.- The American Commercial Model 'They Know They Can Trust Us'.- The BBC Public Service Model 'Turning in his Grave'.- Commercial Pressure on the BBC Serving Neighbourhood and Nation.- The Local Variants of Public Service Radio.- The Listener as Participant: Community Radio in USA, Canada and Australia.- The Listener as Accomplice: Free Radio in Italy and France Participatory Radio in the Third World New Definitions, New Structures.