With the introduction in the mid-1970s of mainstream music on FM radio stations, where it was common practice to program extended performances, musicians were no longer limited to songs of three minutes' duration as dictated by AM stations for decades. The most notable musicians to benefit from this and one of the largest Canadian exports is the progressive rock band, Rush. Rush have produced 25 gold records and 14 platinum (3 multi-platinum) records, making them one of the best-selling ensembles in history, and on April 18, 2013, they were inducted into the Rock and Roll Hall of Fame. In the classical world, homegrown talent Canadian Brass was established in Toronto 1970—they are credited with reshaping concert presentation style for classical artists, now copied and valued everywhere in the classical world.
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