"Arbuckle's Coffee", performed (and probably written) by the Arbuckle Boys from Texas: YouTube clip.

You can find more information on the beginnings of Arbuckle coffee at the Arbuckle Coffee Roasters web site.    In particular, watch the clip toward the bottom of the page (the video for the above song is also available there) and click on the "Arbuckle legend" link at the top of the left-hand links.

Other YouTube clips suggest various ways of preparing "cowboy coffee", but these are modern-day campers' methods without historical authenticity.

Here's another song: "Cowboy Coffee", a more humorous, contemporary song written and performed by Chris Davenport: YouTube clip.

A contemporary song, "Black Coffee" is popular for country line dancing, though it seems to be a whiny love song having blessed little to do with coffee.