The most important was the Grand Ole Opry, aired starting in 1925 by WSM in Nashville and continuing to the present day. Some of the early stars on the Opry were Uncle Dave Macon, Roy Acuff and African American harmonica player DeFord Bailey. WSM's 50,000-watt signal (in 1934) could often be heard across the country. Many musicians performed and recorded songs in any number of styles. Moon Mullican, for example, played Western swing but also recorded songs that can be called rockabilly. Between 1947 and 1949, country crooner Eddy Arnold placed eight songs in the top 10. From 1945 to 1955 Jenny Lou Carson was one of the most prolific songwriters in country music.
The 1870s saw several conservatories open their doors, providing their string, woodwind and brass faculty, leading to the opportunity for any class level of society to learn music. 'One Sweetly Solemn Thought in 1876 by Hamilton-based Robert S. Ambrose, became one of the most popular songs to ever be published in the 19th century. It fulfilled the purpose of being an appropriate song to sing in the parlors of homes that would not permit any non-sacred music to be performed on Sundays. At the same time it could be sung in dance halls or on the stage along with selections from operas and operettas.
Country music was aided by the U.S. Federal Communications Commission's (FCC) Docket 80–90, which led to a significant expansion of FM radio in the 1980s by adding numerous higher-fidelity FM signals to rural and suburban areas. At this point, country music was mainly heard on rural AM radio stations; the expansion of FM was particularly helpful to country music, which migrated to FM from the AM band as AM became overcome by talk radio (the country music stations that stayed on AM developed the classic country format for the AM audience). At the same time, beautiful music stations already in rural areas began abandoning the format (leading to its effective demise) to adopt country music as well. This wider availability of country music led to producers seeking to polish their product for a wider audience. In 1990, Billboard, which had published a country music chart since the 1940s, changed the methodology it used to compile the chart: singles sales were removed from the methodology, and only airplay on country radio determined a song's place on the chart. https://www.youtube.com/channel/UCfRkrq7xfAiSbWaIKJ2vSHg
The idea of a band in country music had never really succeeded on a commercial level -- until Alabama kicked in the door in 1980. RCA rolled the dice on them, and it was an investment that paid off quite well –- over 30 No. 1 singles, 75 million in album sales, and the only band (so far) to win the CMA Entertainer of the Year award three times. To further underscore their success story, all of their singles for RCA in the 1980s -– save 1987’s “Tar Top” -- found their way to the pinnacle of the charts.
By the end of World War II, "mountaineer" string band music known as bluegrass had emerged when Bill Monroe joined with Lester Flatt and Earl Scruggs, introduced by Roy Acuff at the Grand Ole Opry. That was the ordination of bluegrass music and how Bill Monroe became to be known as the "Father of Country Music." Gospel music, too, remained a popular component of bluegrass and other sorts of country music. Red Foley, the biggest country star following World War II, had one of the first million-selling gospel hits ("Peace in the Valley") and also sang boogie, blues and rockabilly. In the post-war period, country music was called "folk" in the trades, and "hillbilly" within the industry. In 1944, The Billboard replaced the term "hillbilly" with "folk songs and blues," and switched to "country" or "country and Western" in 1949. https://www.youtube.com/watch?v=hyNAvdnZ5Ec