Country music

====Bluegrass, folk and gospel====
{{Main|Bluegrass music}}
[[File:MonroeBrothers.jpg|thumb|right|Bill and Charlie Monroe (1936). Bill Monroe (1911–1996) and the Blue Grass Boys created the bluegrass by the end of World War II.]]
By the end of [[World War II]], "mountaineer" string band music known as [[Bluegrass music|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 came to be known as the "Father of Bluegrass." [[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.<ref>{{cite book| first = Charles K.| last = Wolfe|author2=James Edward Akenson| title = Country Music Goes to War| url = https://books.google.com/books?id=Hj9r6l_OZoEC&pg=PA55| year = 2005| publisher = University Press of Kentucky| isbn = 978-0-8131-7188-3| page = 55 }}</ref> In 1944, ''[[Billboard (magazine)|Billboard]]'' replaced the term "hillbilly" with "folk songs and blues," and switched to "country and western" in 1949.<ref>{{cite book| last = Cohen| first = Norm| title = Long Steel Rail: The Railroad in American Folksong (2d ed.)| date = April 17, 2000| publisher = University of Illinois Press| isbn = 978-0-252-06881-2| page = 31 }}</ref><ref>{{cite book| last = Cohen| first = Norm| title = Long Steel Rail: The Railroad in American Folksong| url = https://books.google.com/books?id=AY7St4-8x10C&pg=PA30| access-date = February 1, 2011| year = 2000| publisher = University of Illinois Press| isbn = 978-0-252-06881-2 }}</ref>