In between a poem and a song

In between a poem and a song

A page of opportunity,
Just opened in symphony;
I go do re me,
It's a whole blue sea!

I don't follow the rhyme,
What sings in me is a tune;
A stage without sin and crime,
A tableau that's slow to be soon.

What I couldn't show but see,
The song within and beyond me;
With all its symphony,
Is on its own an opportunity.