Another consideration:    I rarely sing songs in the same keys in which they are printed in songbooks, and I don't think I'm alone in this. Because of the structure of the guitar, it would rarely be possible to transpose one of Sandburg's accompaniments and keep the same added notes, passing tones, and such.

Just as an aside, I have managed a few times to work out guitar accompaniments that were so complex that they took my whole concentration to play, and I didn't have any left over to devote to singing the song. So—back to the old drawing board. . . .

Don Firth