Broadcasting of sports events events from the 1980s, mainly horse races and so-called minority sports. In the early 1990s this arrangement was shaken up by the arrival of pay-TV in the form of BSkyB. Their dedicated sports channels have since become the only place for some major sports to be seen. Starting in 2006 the Irish company Setanta Sports emerged as a challenger to Sky Sports' dominance of the British pay-TV sports market; however, Setanta's UK channel went into bankruptcy administration and off the air in 2009. Between 2009 and 2013 ESPN made an attempt to challenge Sky Sports before its British operations were
Broadcasting in the United States subject to greater regulation than other media. This Blue Network network became the American Broadcasting Company (ABC). Around 1946, ABC, NBC, and CBS began regular television broadcasts. Another TV network, the DuMont Television Network, was founded earlier, but was disbanded in 1956. Television began to replace radio as the chief source of revenue for broadcasting networks. Although many radio programs continued through this decade, including Gunsmoke and The Guiding Light, by 1960 networks had ceased producing entertainment programs. As radio stopped producing formal fifteen-minute to hourly programs, a new format developed. "Top 40" was based on a continuous rotation of