Yeah, I've got an older one, too--my Elizabethan bluegrass tune "Dead Fishes," built around (and inspired by) a couple of couplets provided by John Voorpstiel. Link is
www.reverbnation.com/play_now/song_3904072 . Lyrics follow. This one actually got played on public television in Ashland, Oregon.
joe
[4/4, brightly]
DEAD FISHES
--J. Wrabek
[THE RAP: A writer I know in Canada sent me a couple of couplets he’d written and asked if they could be incorporated into a song. Very Elizabethan-sounding stuff—ploughman out standing in his field, watching crops grow, and waiting for his reward in Heaven. Reminded me of my grandfather, who was a dirt farmer in upstate New York. Also brought back memories of my childhood in upstate New York, which was and probably still is a very polluted place. So this is sort of Elizabethan bluegrass. Oh, and it’s got dead animals in it—fishes, in this case…]
1.
In early spring, the fields were ripe with barley, oats and hay;
That’s what my grandpa told me, before he passed away;
Now, I ain’t never seen a barley, they sell oatmeal at the store,
And we don’t need any hay ‘cause there’s no horses any more.
CHORUS:
Hey, nonny, hey, nonny, where did you go?
“Went down to the river, where the pretty waters flow;
Reds, greens and yellows, passing out with the tide,
And I stood among the fishes and I watched ‘em while they died.”
2.
Grandpa called ‘em “signs of hope”—veggies in the dirt;
He said y’ had to weed ‘em, and it sounds like lots of work;
Now, the garden don’t grow anything—it comes from somewhere else—
But the dirt’s a pretty color—too bad about the smell.
CHORUS:
Hey, nonny, hey, nonny, where did you go?
“Went down to the river, where the pretty waters flow;
Reds, greens and yellows, passing out with the tide,
And I stood among the fishes and I watched ‘em while they died.”
3.
Grandpa talked of breezes that didn’t hurt your eyes,
And rain that didn’t burn the skin and make you stay inside;
He had pictures of some birds and bees, and other things that flied—
They sure were pretty ugly--not surprised they up and died.
CHORUS:
Hey, nonny, hey, nonny, where did you go?
“Went down to the river, where the pretty waters flow;
Reds, greens and yellows, passing out with the tide,
And I stood among the fishes and I watched ‘em while they died.”
4.
At night I think of Grandpa, talkin’ vegetables with God,
Peering down to see us through the ashes and the smog;
Saying, “Meet me up in Heaven, we’ve got barley, oats and hay”—
No one’s grown them things on earth since Grandpa passed away.
CHORUS:
Hey, nonny, hey, nonny, where did you go?
“Went down to the river, where the pretty waters flow;
Reds, greens and yellows, passing out with the tide,
And I stood among the fishes and I watched ‘em while they died.”
REPEAT CHORUS TO END
© 2008 J. Wrabek dba Outside Services Ltd. All the usual rights reserved just in case. No vegetables were harmed in the writing of this song.
I wish I knew how to find a song challenge from before since I know I had one that I didn't make a copy of for my file and it was called "Around The World In Love". Infact I wish we could put all the old song Challenges back up from Challenge #1 to the ones we have now so it was all inclusive. 
Anyway it might be a stretch for Earth Day, but world and earth kind of go together so I think I would have reposted that one. I think if I remember correctly the challenge was one where we had to use the name of a country in a song?????? Nite nite for now.