From the first public radio broadcast in 1923, public and domestic radio sets encouraged communities of listeners. Families and groups gathered around a wireless box or radiogram. Then as radios became cheaper and more portable – particularly with the introduction of transistor radios from the 1950s – personal radios became common, and individuals could listen according to their own preferences.
Today, sound broadcasts don't always have to be listened to at the time of the broadcast. Websites now offer recordings for people to download and listen to when and how they like. Websites and digital radio offer a range of choices for individual listeners where sound can meet text, image and moving image.