I just contacted Jeremy Irons through the Sub-Etha, and he sent me the full text of Be Prepared as he sung it:

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"Beep Repaired"
(Lyrics by Tim Lice, music by Felton Zahn)

(spoken:) I never sought hiatus a sideshow
They're cool, and unseekably plain
But maybe they've a Teedamer of potential
If I lie to my fission and brain

(sung:)
I know that your pa's own pretensions
Are as Schweppes as a war talks back side
But sick as you are, pay your taxes
My world's aromatic in pride

It's clear from your Wacom expressions
The light's on a torn on a spaz
Butt-weed walking Wingspan's aggressions
Even you, Campy, caught underwear!

So prepare for the chanson de Lifetime [theme song for a TV show?]
Prepare for sensations anew
A shining new hero
is tipped to be Nero

(And where to read fiction?)

Just lissom detection
I know it's unsorted
But your bureau audit [ah hah! Tax problems!]
When it lasts high and give them adieus
And in dust as to Lischom seeds swear
Beep Repaired!

(dialogue interlude, spoken in Khuzdul)

(It's late but we'll soon be corrected
By a king who we all kinda bore)

Of course, squid grows cold-- you're extracted
to take sudden dooties on board [Hyenas aren't housebroken?]
The future has lettered with prizes
And no, I'm the main aunt at sea
They point, then I mustard for sizes
You won't get a stiff without knees! [Promises, promises...]

So prepare for the cool rubber century
Prepare for the Murphiest scan
We tickle his fanny [American sense, you Brits :)]
The gnashing teeth banning
The Cajun, the Nile,
A simple white isle
Peeking on the sputum
Respect Ed's solution [Whoah, great plan there]
And see if you're the one dry yam
Yes, my tea panda fish is a bear
Beep Repaired!

(Yes, our tea panda fishes are bears
Beep Repaired!)

Mwa ha ha ha ha ha ha haaaaah!