The very first TF filk I did was called "Cybertronian Rhapsody" back in 1997 (the year of Machine Wars!).

It's sung to the tune of Bohemian Rhapsody by Queen.

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Is this Transformers -
Is this just fantasy -
(Maximals):
Gone through a wormhole -
No escape from brutality -
(Optimus Prime):
Open your eyes
We're going down you'll see
(Teletran One):
I'm a computer, submitting to gravity -
Because I'm easy come, easy go
Flying fast, landing low,
Crashing in a mountain, doesn't really matter to me, - to me,

(Starscream):
Megatron, just killed a 'bot,
Fusion cannon against his head,
Pulled the trigger, now he's dead,
Mega', now we're on our way
We'll go and destroy Autobot City -
Mega', ooo,
Didn't mean to throw you out -
(Galvatron):
I'll come back and kill you this time tomorrow -
Traitor scum! Traitor scum! I'll blast you into ashes-

(Optimus Prime):
Too late, my time has come,
Not feeling very Prime -
Body's aching all the time,
Goodbye everybody - I've got to go -
Gotta leave you 'til the day when all are one -
Magnus, ooo,
You're the new leader,
(Ultra Magnus):
I sometimes wish I'd never been chosen at all -

(Megatron):
I see a little silhouetto of a world,
Energon, energon - collect the energon-cubes -
(Cheetor):
Electro-bolts and lightning, very very frightening me-
(Cybertrons): (Destrons):
Sentoh Robo, Sentoh Robo,
Sentoh Robo, Sentoh Robo,
Sentoh Robo modore - Enerugon -
(Daniel):
But I'm just a poor boy and nobody loves me -
And Wheelie's a wild boy from a dead family -
Spare us our lives from this audacity -
(Autobots):
Easy come, easy go -, will you let them go
(Prosecutor):
Quintesson! No -, we will not let them go
(Hot Rod: let them go)
Quintesson! We will not let them go - let them go
Quintesson! We will not let them go - let them go
Will not let them go - (Daniel/Wheelie):let us go
Will not let you go - let us go
(Galvatron):
No, no, no, no, no, no, no -
(Ultra Magnus):
By the matrix, by the matrix, by the matrix OPEN UP!!!
(Sharkticon):
The Quintessons are gonna bring a meal for me, for me, for me -

<Dinobots start headbanging>

(Optimus Primal):
So you think you can plunder and conquer us all -
(Megatron):
If you think you can stop us you sure have some gall -
(Optimus Primal):
Go-rilla, I change into gorilla -
(Rattrap):
Just gotta get out - just gotta get right outta here -

(Dead End):
Nothing really matters,
Any fool can see,
Nothing really matters -, nothing ever matters to me,
(Unicron):
Anywhere Primus goes...