In radio, genres differentiate strands and formats such as music, radio drama, commercials, documentaries and sports commentaries.
Features are the formal strategies of radio and they are part of radio's articulation.
The bulk of broadcast, using less of radio's features and with lower budget costs than high production radio. Examples are music genres with a presenter, 'rip and read' news, phone-ins with the presenter driving the desk, chat shows. In the theatre and in cinema, formalism was much discussed in the 1920s - filmmakers and theorists such as Sergei Eisenstein, V.I. Pudovkin and Lev Keleshev, and Vsevolod Meyerhold in theatre. They revolted against Russian pre-Revolutionary treatment of narrative material. Generally, formalism means in theatre or film analysis the emphasizing of form over content.