I've given this a lot of thought.
Not dedicated, first-rate thought, but definitely thought.
What song do you think of when you think of Bush?
These are my best bets (in no particular order):
John Fogerty - Fortunate Son: I shouldn't have to explain this one.
Nine Inch Nails - Head Like a Hole: This is probably my current number one, but I'm open to others.
Tom T. Hall - The Monkey Who Became President: Much better in theory than practice; the monkey in the song is far more competent than Bush.
Henry Rollins Band - Liar: I'm liking this one more and more as time goes on.
Frank Zappa - I'm the Slime: Not exactly its intent, but I tend to think Frank would approve.
I know I'm missing some good ones here - at the very least, we might be able to put together a decent mixtape.