As a C & W singer in England I can assure you that the following songs will be taken up & lustily joined by ANY C&W fans.(but sometimes accompanied with groans & cries of trite, old hat & worn out.
The reason they are worn out is because audiences kept asking for them until at one time they were the only songs heard on a C&W night.

But people still join in when you sing 'em. - guaranteed

My Best Friend – Don Williams
Lucille – Kenny Rogers
Folsom Prison – Johnny Cash
Banks of the Ohio – Crystal Gayle (?)
Old Flames – Don Williams
Sea of Heartbreak – Don Gibson
Jambalaya – Hank Williams
Your Cheating Heart – Hank Williams
He'll Have to Go – Jim Reeves
Crazy – Willie Nelson