Which of the following statements is not true about country music?

A、Countrymusictookitsrootsintraditionalfolkmusic,Celticmusic,gospelmusic,andold-timemusicandevolvedquicklyinthe1920s.;
B、Countrymusicwaslaterreplacedbyhillbillymusicbecausethetermwasthoughtpoliticallyincorrect.;
C、Westernswing,bluegrass,outlawcountryandcountrypopweresomeofthesubgenresofcountrymusic.;
D、Countrymusicisusuallyassociatedwith"love"and"thegoodolddays".