Civil war songs:
Tenting tonight
Eating ****er's Peas
...

Old cowboy songs:
Oh Bury me not
Chisum trail
Red River Valley
Home on the Range
...

Folk Songs:
If I had a hammer
Where have all the flowers gone
anything by Joan Biaz
...

Maybe some drinking songs:
Drunk tonight
Let me go home
...

Hope this gives you places to look
Joe