A short film from the late 1930s commissioned by the Finnish Broadcasting Company Yleisradio's propaganda department showcases Kouluradio (School Radio), a radio broadcast for school children, and also includes "myths and truths about the signs of spring". The film is narrated by Pekka Tiilikainen, and radio announcer Kaisu Puuska-Joki portrays, among other things, a lark on May Day morning.