I love Bradbury, especially the Martian Chronicles....
Mine would probably have to be "We Have Fed You All For A Thousand Years" by an unknown proletarian....with this fourth verse added:
Now we hide from you within the caves
For you try to kill our past,
To hide the truth from yourselves
That our songs will all outlast
The money, the power, and the tyranny
In the offices where you stand!
If blood be the price of your oppressive wealth
Good God! We have bought it grand.
Yes, I know it is a weak ending but it is a folksong and very liable to change....