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Radiohead – You and Whose Army? Lyrics 11 years ago
This song touches on themes of death. That's the crux of it. However looking at it more carefully, we see political aspects.

mentions of an army, cronies and the "holy" roman empire

considering the army, well, most governments have armies. in this song the army does not sound like a force of protection, more like a force to fear. a tyrannical, power-hungry force. clearly, they're not good if they're being challenged "come on, come on..."

i find "cronies" here to have a sort of sinister malevolent implication. criminal.
the people in a comfy position in the government.

the holy roman empire reference, as pointed out by alexhuxleyon was neither holy nor Roman, nor an empire. this seems to be a sort of clever jab at the government, who probably feel as if they are as powerful and important as the roman empire, even going so far as being seen as "holy".

Finally, the most important element: the Ghost Horses.
this to me makes me think of the 4 Horsemen of the Apocalypse.
Conquest, War, Famine and Death: 4 things governments are capable of (and do commit).

"you forget so easily" could mean anything.
it could be directed to people who don't realize the government is this malevolent, or it could be directed to the government, telling them that they either a) forget that they are people or b) forget that the people have power to fight back.

this makes me think that the song could also be some sort of protest song, tying in with point b.

anyways, that's my take.

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