In 1927 the United States population changed from mostly rural to mostly urban.
Country music is genre of American popular music that originated in the agrarian regions of the Southern United States in the 1920s. It takes its roots from southeastern American folk music … Jimmie Rodgers and the Carter Family are widely considered to be important early country musicians … Beginning in 1927, and for the next 17 years, the Carters recorded some 300 old-time ballads, traditional tunes, country songs and gospel hymns.
In other words, country music was born when most Americans didn’t live in the country.
Now, 80% of the U.S. lives in urbanized areas and Country Music is the most listened to rush hour genre.
When I see Cabin Porn’s Tumblr follower count approach 100,000 – a big number for a single-serving photo blog – I assume it’s the same paradigm of nostalgia.
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The country music/urban population phenomenon is discussed Radiolab’s episode Songs that Cross Borders.