WSM (650 kHz) is a 50,000-watt clear channel AM radio station located in Nashville, Tennessee. It broadcasts a full-time country music format (with classic country and Americana leanings, the latter of which is branded as "Route 650") at 650 kHz and is known primarily as the home of the Grand Ole Opry, the world's longest running radio program. The station's clear channel signal can reach much of North America and nearby countries, especially late at night. It is one of two clear-channel stations in North America, along with CFZM in Toronto, that still primarily broadcast music; as recently as 2020, the station was live and locally originated during the overnight hours, but the overnight host position was eliminated in February 2020. Nicknamed "The Air Castle of the South," it spawned two sister stations on newer mediums: WSM-FM, which signed off in 1951 (WSM bought a different FM station in the 1960s which now has the WSM-FM callsign; and television Channel 4 (originally WSM-TV, and now WSMV-TV), which was later sold separately. The current WSM-FM is no longer affiliated with WSM, while the owners of WSMV and WSM jointly operate the television network Circle, which airs on a subchannel of WSMV and simulcasts portions of the Opry with WSM. WSM is owned by Opry Entertainment Group, a joint venture of Ryman Hospitality Properties, NBCUniversal and Atairos. Heritage Founded by the National Life and Accident Insurance Company as a platform to sell the company's insurance products, WSM first signed on October 5, 1925. George D. Hay, a newspaper reporter from Memphis, was WSM's first program director. It is primarily associated with the popularization of country music through its weekly Saturday night program, the Grand Ole Opry, the longest-running radio program in history. The Opry began as the WSM Barn Dance on November 28, 1925, with Uncle Jimmy Thompson as the first performer. On December 10, 1927, host George D. Hay, referred to the programming as being "Grand Ole Opry" in contrast to the preceding grand opera program on NBC. Hay is quoted: "For the past hour we have been listening to music largely from Grand Opera, but from now on we will present 'The Grand Ole Opry.'" In 1932, WSM boosted its power to 50,000 watts, becoming Tennessee's first clear-channel station. In addition to its vast nighttime coverage area, the station boasts one of the largest daytime coverage areas in the country.