New technologies and changing habits mean the way people listen to the radio has been revolutionised in recent years.
A week of articles on the 40th birthdays of Radios 1 to 4 concludes by asking leading industry figures how they believe radio is shaping up for the next four decades.
Now, you do not even need to own a set to hear programmes - mobile phones and MP3 players come equipped with tuners while stations are available through TVs on set-top boxes.
And on-demand services and podcasts offer a way to listen when it suits, rather than following a schedule.
Read more at BBC News:
http://news.bbc.co.uk/2/hi/entertainment/7014952.stm
