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.
The 1970s saw the growth of the “outlaw” music of prominent Nashville expatriates Willie Nelson and Waylon Jennings. The gap between country and the mainstream of pop music continued to narrow in that decade and the next as electric guitars replaced more traditional instruments and country music became more acceptable to a national urban audience. Country retained its vitality into the late 20th century with such diverse performers as Dolly Parton, Randy Travis, Garth Brooks, Reba McEntire, Emmylou Harris, and Lyle Lovett. Despite its embrace of other popular styles, country music retained an unmistakable character as one of the few truly indigenous American musical styles.
The same period saw a concerted effort to recover some of country music’s root values. Mandolin-player Bill Monroe and his string band, the Blue Grass Boys, discarded more recently adopted rhythms and instruments and brought back the lead fiddle and high harmony singing. His banjoist, Earl Scruggs, developed a brilliant three-finger picking style that brought the instrument into a lead position. Their music, with its driving, syncopated rhythms and instrumental virtuosity, took the name “bluegrass” from Monroe’s band.
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