The old Jimmie Rodgers "Waitin' for a Train" is an easy enough song to play, and satisfying, as well. The yodel is your basic yodel, as well-- Check me on this, but my recollection is that movie and TV cowboys yodelled a lot, but it wasn't typical in real cowboys songs, which gravitated toward "Come-a-ti-yi-yippee-yippee yay" or "Whoopi-ti-yi-yo-oh" sort of things, instead--