That link to the Ranger Ballads has as its first lyric, Texas Rangers

I haven't located King of Borneo, Going Back To Texas (lots of references though), Dolan's Poker Party, Jolly Coppersmith (again lots of references to sheet music), and I learned about Woman From Her.

I haven't started on the stuff after the Old Chisholm Trail. Some of the others are SO certain to be in the DT that I haven't linked to them. Red River Valley, Cowboy's Lament, Big Rock Candy Mountain are some of these.