"Traffic Island Discs is a radio programme about music, people and spaces. We roam the streets looking for people wearing headphones, stop them, and interview them while recording whatever they are listening to. The result is a half hour tour of an area of London, heard through people's personal tastes and rhythms."
On the show I heard (Fitzrovia and Soho), I'm not sure the presenter is actually required. Far better to let the music and listener - the sound of the city - speak for itself. Great idea though.