Bluegrass is not an old-time style at all

[Bluegrass] is not an old-time style at all; it did not begin to take shape as a distinct entity until the mid-1940s, and it was not named till a decade later… the music, of course, drew upon earlier string band and vocal styles and repertory (as most forms of country music did), but they inherited and borrowed styles were significantly modified [i.e., updated]

B. Malone, Country Music USA (5th Edition, 2018), 380

So fascinated by Rodgers’s tenor yodeling sound that they thought of him as a deity

The most bizarre manifestation of Rodgers’s worldwide appeal came right after World War II in Kenya, after a British missionary played some of Jimmie’s records for members of the Kipsigis tribe. Apparently, some of the tribesmen were so fascinated by Rodgers’s tenor yodeling sound that they thought of him as a deity and they made up a sing about him called “Chemirocha” that they sang at religious ceremonies for many years 

B. Malone, Country Music USA (5th Edition, 2018), 101

For country music, the coming of Elvis was a disaster

For country music, the coming of Elvis was a disaster. As the standard soundtrack for many Southern homes, country music bound generations together. That began to end with the coming of rock ‘n’ roll. At first, the music industry regarded artists such as Elvis, Carl Perkins, Jerry Lee Lewis, and the Everly Brothers as country acts who happened to have special appeal for the kids. But as these artists increasingly dominated the Top 10 country charts, pushing out adult artists, country record promoters began to demand that the trade magazines get the young rock ‘n’ rollers off the country charts before they destroyed the essence of country music. By the end of the 1961, Elvis and the Everly Brothers were gone from the country charts.

M. Kosser, How Nashville became Music City USA (2006), 37