Without overloading you..... country music is exemplified in these artists.
Hank Williams Sr, & Jr.
Willie Nelson
Waylon Jennings
George Jones
Merle Haggard
Patsy Cline
Loretta Lynn
Buck Owens
and that's just a very small starting place. If you didn't grow up on these artists, I'd suggest hitting YouTube and look them up and listen.
A bit more modern but still solidly rooted in country would include:
Alabama
Brooks & Dunn
Emmy Lou Harris
Garth Brooks
Trisha Yearwood
Lacy J Dalton
Reba MacIntire
There are so many other artists and groups who were instrumental in the history of country music.... the more you dig, the more you will find.
edit to add: and don't forget the classic duet combo's....
Conway & Loretta,
Kenny Rogers and Dolly Parton,
Kenny Rogers and Dottie West<<< YOU GOTTA HEAR THAT.
https://www.youtube.com/watch?v=wlcRqPG1OeQGeorge Jones and Tammy Wynette.
Every one of those are country classics.