The document discusses four magazine publishing companies in the UK - Bauer, IPC Media, Emap, and Future PLC. It provides details on when each company was established, who owns them, examples of the types of magazines they publish, and whether their magazines are mainstream or niche. The concluding paragraphs discuss how Blumler and Katz's uses and gratifications theory suggests that media users actively choose media sources that fulfill their needs, such as diversion, personal relationships, personal identity, and surveillance. Billboard magazine is used as an example of how it can fulfill these four needs.