A Poem in My Head

I've got a poem in my head
itching to get out.
The lines rattle around in my brain--
They 'peat and repeat'
--as I weigh the worth of each sentence in words.
Different phrases, and rhythms, and lines--
I recite it to myself silently, out loud
and read it over and over again.
When is it finished?
Will I know when it's done?
What works and what doesn't?
And is it really a poem?
And suddenly, it is perfect--
Just what I wanted to say.
Another poem, a perfect verse.
And it's mine.