OK, :) last night I did tweak it a little for scansion and added a new verse:

Earworm, earworm
Seizing my cerebrum;
Pernicious piece of doggerel
Repetetive refrain.

Earworm, earworm
Crippling my consciousness
Mind-devouring melody
And endless loop of pain.

Earworm, earworm
Withering my will to live
There must be some way to
Extricate you from my brain.

Earworm, earworm
F#$!ing up my faculties
You and your annoying tune
Are driving me insane.

Slán,

~Fionn

www.geocities.com/children_of_lir