BBC World Service Archive is a prototype website that is attempting to catalog around 70,000 English-language programs from the BBC World Service audio archive. Registered users can listen to steaming audio files in a variety of genres and program formats from the past sixty years of BBC World Service broadcasts. These archive files have all been categorized by a machine, but users are encouraged to add category tags and images of their own, in order to provide more accurate descriptions.
The programs can range from anything to historical recordings, music, audio documentaries, news programs, and more. There is a significant amount of audio drama available, as well. There are decades worth of Play Of The Week and Theatre Of The Air radio dramas, many of which have not been available to listen to for some time. The Diversity Website is building a linked list of these programs.
Registration is required, but free.