Ah
I suppose it depends where you put the emphasis.

Your emphasis is on "A letter" whereas I think the song tells you there's a letter missing. It is the letter B.

And I'm sure this exists other than in Manic's mind as I've heard it before.
( Joliet has some fucking Jaffa Cakes in her coat pocket!, Fri 18 Apr 2008, 16:43, archived)

Then we have a clear case of mindpiss
or someone is singing one of my "I am drunk enough to sing" songs without permission
( Manic declared war on Old Media, Fri 18 Apr 2008, 16:46, archived)