Here are some off the top of my head
Classic Country -
George Jones - "He Stopped Loving Her Today", "The Grand Tour", "She thinks I still care", "White Lightning", "Choices", "I don't care if tomorrow never comes" (duet w/ Hank Jr), and many more...
Johnny Cash - "I Walk the Line", "Folsom Prison Blues", "Cocaine Blues", "A boy named Sue", "Ballad of Ira Hayes", "Man in Black", "Ain't no good chain gang"(w/ Waylon Jennings), "Crazy Old Soldier"( w/Ray Charles)...and many more
Hank Williams Jr - "Family Tradition", "Dinosaur" (greatest Hank Jr song), "Feelin' Better", "All my Rowdy Friends have Settled Down", "If the South woulda won", "Whiskey Bent and Hell Bound", "A Country Boy can Survive", "Man of Steel".....and many more (except the latest stuff)
Outlaw Country -
Hank III - "Crazed Country Rebel", "I Don't Know", "If the shoe fits", "H8 Line", "P.F.F.", "Atlantic City", "The grand ole opry ain't so grand anymore"
Chris Knight - "Rural Route", "River Road", "Bridle on a Bull", "It ain't easy being me"
Red Dirt -
Casey Donahew Band - "White Trash Story", "12Ga"
Reckless Kelly - "Vancouver", "Wicked Twisted Road", "Sixgun", "7 nights in Ireland"
Corb Lund Band - "Hurtin Albertan", "Copenhagan"
New Country -
Luke Bryan - "We rode in trucks", "All my friends say"
Eric Church - "Before She does", "The Lightning", "These boots"
The Roadhammers - "I'm a roadhammer", "Girl on the Billboard"
The Jamey Johnson songs I mentioned before..
80's country -
Shenandoah - "Darned if I don't danged if I do", Church on Cumberland Road", Janie Baker's love slave", "If Bubba can Dance"
Diamond Rio - "Bubba Hyde", "Norma Jean Rylie", "Meet in the Middle"
Randy Travis - "1982", "Better class of losers", " I thought he walked on water"
Mark Chesnutt - "Too cold at home", "Old Flames", "I just wanted you to know", "It sure is Monday"....and many more
I have alot more, but thats some country to get you started....enjoy