The Eagles began as a country band.
BB King does W Nelson's Nightlife' and made a hit of it for himself.
Ray Charles made a hit out of Harlon Howards "busted".
And everybody made Dolly's retirement fund by recording, I'll always love you... a big Xover hit.
Hoyt Axton who clearly made his fame singing and writting Country songs also Xovered into POp/Rock with the tunes he wrote for 3 Dog Night... and his mom? mae Axton made Elvis' day when he recorded Heartbreak Hotel.
When there's more truth in the song than rhyme, and sizzle or sparkle, you usually find a good song writter behind it... American music or Country music now, used to get a lot of these sorts and the music world at large benefitted from them by rearranging their songs to suit another genre..