Well, I have some happy news for all my "fans" who have shown their unwavering "heartwarming" support in the last day or so.
I talked with a professional sound guy I used to work with and he said:
You cannot use one single verse or anything from another song or you are subject to a lawsuit unless you get the approval from the original artist.
I wonder if Julia Ward Howe had any worries about her song?
"John Brown's Body" (originally known as "John Brown's Song") is a United States marching song about the abolitionist John Brown. The song was popular in the Union during the American Civil War. The tune arose out of the folk hymn tradition of the American camp meeting movement of the late 18th and early 19th century. According to an 1889 account, the original John Brown lyrics were a collective effort by a group of Union soldiers who were referring both to the famous John Brown and also, humorously, to a Sergeant John Brown of their own battalion. Various other authors have published additional verses or claimed credit for originating the John Brown lyrics and tune.
The "flavor of coarseness, possibly of irreverence" led many of the era to feel uncomfortable with the earliest "John Brown" lyrics. This in turn led to the creation of many variant versions of the text that aspired to a higher literary quality. The most famous of these is Julia Ward Howe's "Battle Hymn of the Republic", which was written when a friend suggested, "Why do you not write some good words for that stirring tune?" Kimball suggests that President Lincoln made this suggestion to Howe, though other sources[which?] do not agree on this point.
Numerous informal versions and adaptations of the lyrics and music have been created from the mid-1800s to the present, making "John Brown's Body" an example of a living folk music tradition.
-- Wikipedia: John Brown's Body
Actually, Coldplay had a lawsuit over "Viva La Vida" where they were sued over taking something from a previous song (I believe) -- I think Coldplay won from what the sound guy said.
So, I'm still not giving up. I will only have to live long enough until "Viva La Vida" becomes public domain then I can get back to work. That could take a while.
So leave the light on for me.