The BBC News programme where you set the agenda.
Listen now 55 mins
It's the UN's World Radio Day and we'll be live from Unesco's HQ in Paris at 1800GMT, talking to guests there and around the world. They'll discuss the momentous radio they remember, including assassinations, disasters, world-changing news events, great speeches and appointment-to-listen programmes. Has something you've heard on the radio had a great impact on your life?